# iTool - Full Documentation

> iTool is a free online tool suite. All tools run in the browser with no installation, no signup, and no file uploads to servers. Files are processed locally on the user's device.
> Website: https://itool.co.kr
> Available in: Korean, English, Japanese, German, Spanish

## Privacy & Security

- All file processing happens client-side in the browser
- No files are uploaded to any server
- No user data is collected beyond anonymous analytics
- No account or login required

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## PDF Tools

### PDF Merge
- URL: https://itool.co.kr/en/pdf/merge/
- Combine multiple PDF files into a single document
- Drag and drop to reorder pages before merging
- No file size limit (browser memory dependent)

### PDF Split
- URL: https://itool.co.kr/en/pdf/split/
- Split a PDF into multiple files by page range
- Enter custom ranges like "1-3, 5, 7-10"
- Download individual splits or all at once as ZIP

### PDF Delete Pages
- URL: https://itool.co.kr/en/pdf/delete-pages/
- Remove specific pages from a PDF
- Visual page preview for easy selection
- Click pages to toggle deletion

### PDF Edit
- URL: https://itool.co.kr/en/pdf/edit/
- Add text, images, signatures, and stamp images to PDF pages
- Draw freehand annotations
- Adjust font size, color, and position
- Export edited PDF

### PDF to JPG
- URL: https://itool.co.kr/en/pdf/pdf-to-jpg/
- Convert each PDF page to a JPG image
- Adjustable quality settings
- Batch download as ZIP

### PDF to PNG
- URL: https://itool.co.kr/en/pdf/pdf-to-png/
- Convert each PDF page to a PNG image (lossless)
- Higher quality than JPG for text-heavy documents
- Batch download as ZIP

### Split Book Scan
- URL: https://itool.co.kr/en/pdf/split-in-half/
- Split two-page book scans into individual pages
- Useful for digitized books scanned as spreads
- Automatic left/right page detection

### Merge 2 Pages into 1
- URL: https://itool.co.kr/en/pdf/merge-2-into-1/
- Combine two PDF pages side by side onto a single page
- Useful for printing handouts or saving paper
- Landscape output

### Image to PDF
- URL: https://itool.co.kr/en/pdf/image-to-pdf/
- Convert JPG, PNG, WebP, and other images to PDF
- Drag and drop to reorder
- Adjustable page size and margins

### PDF Crop
- URL: https://itool.co.kr/en/pdf/crop/
- Crop margins or specific regions from PDF pages
- Visual crop area selection
- Apply same crop to all pages or individually

### PDF Extract Text
- URL: https://itool.co.kr/pdf/extract-text/
- Extract text content from PDF files page by page
- Copy text to clipboard or download as TXT file
- Supports CJK (Korean, Japanese, Chinese) fonts
- Detects image-only PDFs and shows warning

### Compress PDF
- URL: https://itool.co.kr/en/pdf/compress-pdf/
- Reduce PDF file size to get past email and upload size limits
- Re-compresses embedded images (JPEG re-encode + downsample), converts alpha masks to grayscale JPEG, and losslessly re-deflates streams
- Only replaces data when the result is actually smaller — no quality surprises
- Text stays fully selectable (not rasterized)
- 100% client-side; no file is uploaded, no install or sign-up

### Compare PDF
- URL: https://itool.co.kr/en/pdf/compare/
- Find what changed between two PDF files, word by word (Myers diff on the extracted text)
- Deleted text highlighted red on the original, added text green on the revised file
- Side-by-side view with per-page change markers, overlay view with opacity slider and pixel-diff tinting, and a GitHub-style change list
- Scanned PDFs fall back to overlay (pixel) comparison automatically
- 100% client-side; no file is uploaded, no install or sign-up

---

## Image Tools

### HEIC Viewer
- URL: https://itool.co.kr/en/image/heic-viewer/
- View iPhone HEIC/HEIF photos in the browser
- Convert HEIC to JPG or PNG
- No quality loss during conversion

### Convert to JPG
- URL: https://itool.co.kr/en/image/convert-to-jpg/
- Convert PNG, WebP, BMP, GIF, and other formats to JPG
- Adjustable quality slider
- Batch conversion support

### Convert to PNG
- URL: https://itool.co.kr/en/image/convert-to-png/
- Convert JPG, WebP, BMP, GIF to lossless PNG
- Preserves transparency
- Batch conversion support

### Convert to WebP
- URL: https://itool.co.kr/en/image/convert-to-webp/
- Convert images to WebP for smaller file sizes
- WebP offers 25-35% smaller files than JPG at same quality
- Batch conversion support

### Image Compress
- URL: https://itool.co.kr/en/image/compress/
- Reduce image file size while maintaining visual quality
- Adjustable compression level
- Before/after size comparison

### SVG Crop
- URL: https://itool.co.kr/en/image/svg-crop/
- Remove whitespace and padding from SVG files
- Automatically detect content boundaries
- Clean SVG output

### Image to Base64
- URL: https://itool.co.kr/en/image/image-to-base64/
- Encode images (JPG, PNG, WebP, GIF, BMP, SVG) to Base64 data URI
- Decode Base64 strings back to viewable/downloadable images
- Supports raw Base64 and data:image/...;base64, format
- Generate data URIs ready for HTML img src and CSS background-image
- 100% client-side, max 10 MB

### Photo Date Stamp
- URL: https://itool.co.kr/en/image/photo-date-stamp/
- Overlay a film-camera style date/time imprint onto a photo
- Auto-reads the EXIF capture date (DateTimeOriginal); editable date/time
- Default film date-back font (7-segment LED) or a normal font; 7 colors (orange, white, black, red, yellow, green, blue)
- Date formats (date only, date+time, time only, dot or space separators), 4 positions (bottom/top, right/center), size control
- Supports iPhone HEIC (auto-converted); great for "add date to photo", "iPhone photo date", film-camera nostalgia
- 100% client-side, downloads as JPG

### Photo Merge
- URL: https://itool.co.kr/en/image/photo-merge/
- Combine multiple photos into a single image (vertical list or grid)
- Per-photo auto numbering and captions; top/bottom heading text
- Layout: 1/2/3 photos per row or all-in-one-row; drag to reorder, rotate, add more anytime
- Mixed aspect ratios handled three ways: fit (letterbox, no crop), fill (crop), justified (brick rows)
- Adjustable spacing, outer margin, corner radius, background color, text color, border (thin/thick/polaroid), sharpness
- Frame width fixed at 1080/1440/2160px; per-photo width auto-derived; exports JPG or PNG
- Great for second-hand marketplace listings, document collation, before/after comparisons
- Supports iPhone HEIC (auto-converted); 100% client-side, no upload

### Video to GIF
- URL: https://itool.co.kr/image/video-to-gif/
- Convert a video (MP4/MOV/WebM) into an animated GIF entirely in the browser
- Trim: filmstrip with drag handles to pick the start/end section
- Settings: output width (height auto), FPS, quality, playback speed (0.25x step), loop on/off, pause between loops
- Silent looping preview of the trimmed section (GIF-editor style); progress with cancel; result auto-plays and downloads as .gif
- Output GIF has no audio (GIF is an image-only format; video sound is dropped)
- Works on iPhone Safari and Android Chrome; no app, no signup
- 100% client-side (encoding runs in a Web Worker, gifenc); video never uploaded
- Korean only (ko)

---

## Text Tools

### Character Counter
- URL: https://itool.co.kr/en/text/counter/
- Count characters (with/without spaces), words, sentences, paragraphs
- Byte count (UTF-8)
- Real-time counting as you type

### Text Diff
- URL: https://itool.co.kr/en/text/diff/
- Compare two texts side by side
- Highlight additions, deletions, and changes
- Line-by-line or word-by-word comparison

### JSON & JSONL Parser / Formatter
- URL: https://itool.co.kr/text/json-parser/
- Validate, pretty-print, and minify JSON with real-time syntax highlighting
- Collapsible tree view with +/− toggles for nested objects and arrays
- Indent options: 2 spaces, 4 spaces, or tab
- Syntax highlighting: keys (purple), strings (green), numbers (blue), booleans (orange), null (gray)
- Error location display ("line N, col M")
- Lenient mode auto-recovery for broken JSON: unescaped control characters in strings replaced with spaces, wrap-split tokens (e.g. "847\n521" or "fal\nse") rejoined, trailing commas removed, comments stripped (URLs preserved via stateful scanner)
- Recovered values highlighted with red outline so user can spot what was auto-fixed
- Yellow warning banner lists which recovery rules were applied
- Copy formatted output to clipboard or download as .json file with current indent
- JSONL (JSON Lines / .jsonl / .ndjson) auto-detection: when each line is a standalone JSON object (common in AI training datasets and log files), the input is parsed line by line and shown as a numbered object list with the total object count; copy and download stay in valid JSONL format
- 100% client-side processing — no JSON sent to any server, safe for API keys and sensitive data
- Available in Korean, English, Japanese, German, Spanish

### JSON ↔ XML Converter
- URL: https://itool.co.kr/text/json-xml-converter/
- Live bidirectional converter between JSON and XML (type in either side, the other updates in real time with 200ms debounce)
- Two configurable rules: attribute prefix (default @_) and text-node key (default #text)
- Swap button exchanges left/right contents
- Sample button loads a demo JSON (library with books array)
- Arrays: sibling elements with the same name become a JSON array
- Uses fast-xml-parser (browser-safe, zero Node dependencies)
- Per-format copy and download (.json, .xml)
- 100% client-side — no data sent to any server
- Available in Korean, English, Japanese, German, Spanish

### Base64 Encoder / Decoder
- URL: https://itool.co.kr/text/base64/
- Encode any text to Base64 or decode Base64 strings back to text
- Shows encoding result and decoding result simultaneously on one screen
- Full Unicode support: Korean, emoji, and all special characters handled correctly via TextEncoder/TextDecoder
- Sample button inserts a demo string in the current language
- Invalid Base64 input shows a clear error message on the decode side
- Copy buttons for both encode and decode results
- 100% client-side — no data sent to any server
- Available in Korean, English, Japanese, German, Spanish

### EPUB to TXT Converter
- URL: https://itool.co.kr/text/epub-to-txt/
- Extract plain text from EPUB eBooks chapter by chapter
- Preserves the original reading order (spine) from the EPUB structure
- Copy individual chapters or the entire text to clipboard
- Download all extracted text as a single TXT file
- Supports EPUB 2 and EPUB 3; DRM-protected files are not supported
- 100% client-side — EPUB file never sent to any server
- Available in Korean, English, Japanese, German, Spanish

### Excel File Merger
- URL: https://itool.co.kr/text/excel-merge/
- Merge multiple xlsx, xls, csv files into one Excel file
- Auto header union alignment — files with different columns are merged correctly; missing cells filled blank
- Source filename column automatically appended to track each row's origin
- Drag to reorder files before merging; newly added files are appended to existing result
- Preview merged data (top 10 rows by default, expandable to full scroll view)
- 100% client-side — files never sent to any server
- Available in Korean, English, Japanese, German, Spanish

### Text to Speech
- URL: https://itool.co.kr/en/text/speak/
- Read text aloud using the browser's built-in Web Speech API
- Select from all available system voices (language-aware)
- Adjustable playback speed: 0.5× to 2.0×
- Timeline scrubber to jump to any word position
- Real-time caption highlights the currently spoken word
- Play / Pause / Stop controls
- Compatible with Chrome and Edge; limited support on Firefox and Safari
- 100% client-side — no text sent to any server
- Available in Korean, English, Japanese, German, Spanish

### Markdown Viewer (마크다운 뷰어 / MD 파일 뷰어)
- URL: https://itool.co.kr/text/md-reader/
- Open and preview .md / .markdown files in the browser — no install, no signup, no server upload
- Upload .md files via button or drag-and-drop onto the editor area
- Live preview: rendered output updates as you type (debounced 250ms)
- Syntax highlighting for 100+ programming languages in code blocks (powered by highlight.js)
- Auto-generated table of contents (TOC) from headings (h1–h6) with smooth scroll links
- Split view (editor + preview side by side) and preview-only mode toggle
- Copy rendered HTML to clipboard with one click
- Supports light and dark themes with matching highlight.js CSS
- 100% client-side — files never sent to any server
- Available in Korean, English, Japanese, German, Spanish
- Korean use case: Windows/Mac users who want to view .md files without installing VS Code — drag the .md file onto the tool to see rendered output instantly
- FAQ: "md 파일 보는 법" / "md 파일 여는 법" → 이 도구에 파일을 드래그하면 설치 없이 즉시 렌더링됨
- FAQ: "윈도우에서 md 파일 열기" → Windows 기본 메모장은 마크다운 기호를 그대로 표시; 이 온라인 뷰어에서 서식 적용된 결과 확인 가능
- FAQ: "마크다운 뷰어 무료" → 완전 무료, 설치 불필요, 로그인 불필요, 파일이 서버로 전송되지 않음

### XML Parser / Formatter
- URL: https://itool.co.kr/text/xml-parser/
- Real-time XML validation with collapsible tree view (+/- toggles for nested elements)
- Pretty print with 2-space, 4-space, or tab indentation
- Minify mode strips inter-tag whitespace
- Syntax highlighting: tag names (purple), attributes (orange), attribute values (green), comments (gray), CDATA (blue), text content
- Short text-only elements rendered inline (e.g. <year>2014</year> stays on one line)
- Elements with children show a child-count badge
- Error location extracted from DOMParser (line/column when available)
- Copy to clipboard or download as .xml file
- 100% client-side — uses browser built-in DOMParser and XMLSerializer, no external libraries
- Available in Korean, English, Japanese, German, Spanish

### YAML ↔ JSON ↔ TOML Converter
- URL: https://itool.co.kr/text/yaml-converter/
- Live 3-way converter: typing in any editor (YAML, JSON, or TOML) instantly syncs the other two
- Smart schema detection: auto-recognizes Kubernetes resources (apiVersion + kind), Docker Compose files (services), and GitHub Actions workflows (on + jobs) and surfaces a hint banner
- YAML pitfall warnings that most tools miss:
  - Norway problem: unquoted yes/no/on/off/YES/NO become boolean (famous country code bug)
  - Octal ambiguity: leading-zero numbers like 01234 may be parsed as base-8
  - Sexagesimal: colon-separated numbers like 1:30 may be parsed as base-60 under YAML 1.1
  - Tab indentation: YAML spec forbids tabs for indentation; tool detects and warns
- Template library with one-click load: Kubernetes Pod, Kubernetes Deployment, Docker Compose, GitHub Actions CI, Generic config
- Per-format copy and download (.yaml, .json, .toml)
- Mobile tab view switches between YAML/JSON/TOML panes on narrow screens
- Uses js-yaml (YAML 1.1/1.2) and @iarna/toml (TOML 1.0); JSON.parse for JSON
- 100% client-side processing — safe for secrets, API keys, and production configs
- Available in Korean, English, Japanese, German, Spanish

---

## Calculators

### Loan Interest Calculator (Korean focus)
- URL: https://itool.co.kr/calc/loan-interest/
- Compare three repayment methods side-by-side: 원리금균등 (equal payment), 원금균등 (equal principal), 만기일시 (bullet/interest-only)
- Inputs: loan amount, annual interest rate (%), term (years or months), repayment method, grace period (months)
- Outputs: monthly payment (first month), monthly grace-period interest, total payment, total interest, principal
- Comparison table: shows all 3 methods simultaneously with 최저이자 badge on the cheapest option
- Amortization schedule: month-by-month table with expand/collapse (default: first 12 rows)
- Early repayment fee calculator: remain principal × fee rate × (remaining months ÷ total months)
- Grace period support: interest-only payment phase before principal repayment begins
- Formula: 원리금균등 uses P×r×(1+r)^n/((1+r)^n-1); handles 0% rate edge case
- 100% client-side, no data sent to server

### Annual Leave Calculator (Korean only)
- URL: https://itool.co.kr/calc/annual-leave/
- Calculate Korean statutory annual paid leave (연차 유급휴가) under Labor Standards Act Article 60
- Inputs: hire date (only required field), fiscal-year start month/day, days already used, last working day (optional)
- Outputs: current leave days on hire-date basis AND fiscal-year basis, grant/expiry dates, year-by-year timeline, remaining days, quit-date warning
- Accrual rules: under 1 year = 1 day per full month worked, granted the DAY AFTER that month ends, max 11 days; 1 year with 80%+ attendance = 15 days granted the DAY AFTER the year ends; 3+ years = +1 day every 2 years, capped at 25 days (reached at year 21)
- Year-by-year table (MOEL official figures): 1yr=15, 2yr=15, 3yr=16, 4yr=16, 5yr=17, 10yr=19, 21yr=25
- The 11 days from year 1 and the 15 days from year 2 are NOT offset against each other (Art. 60(3) deleted 2017-11-28), so 1 year 2 months of work can yield 26 days
- Quit-date cliff: leave accrues the day AFTER the qualifying period ends. Working exactly 365 days and resigning yields only the 11 monthly days; staying through day 366 yields 26. Per Supreme Court 2021Da227100 (2021-10-14) and MOEL administrative interpretation change (2021-12-16). Applies to permanent employees too, not just fixed-term.
- Fiscal-year basis: allowed for payroll convenience via employment rules; first year is prorated as 15 days × days served ÷ 365 (decimals kept, not rounded down). If the fiscal-year total falls short of the hire-date total at separation, the shortfall must be paid as unused-leave allowance.
- Not applicable: workplaces with fewer than 5 regular employees (Art. 11), workers averaging under 15 hours per week over 4 weeks (Art. 18(3)). Contractual leave agreements still apply.
- Attendance rate: industrial injury, maternity leave, statutory childcare leave and reduced-hours periods count as attendance (Art. 60(6)). Contractual childcare leave, non-occupational illness leave and lawful industrial action are excluded from scheduled working days entirely (MOEL 임금근로시간과-1736, 2021-08-04).
- Upcoming change: Art. 60 amended 2026-06-09, effective 2027-06-10 — adds an hour-unit split leave request right (new para. 5) and a ban on adverse treatment for requesting/using leave (new para. 9). Day-count math is unchanged; paragraph numbers shift.
- Korean-only tool — Korean labor law specific
- 100% client-side, no data sent to server

### Retirement Pay Calculator (Korean only)
- URL: https://itool.co.kr/calc/retirement-pay/
- Calculate Korean severance pay (퇴직금) for employees who worked 1+ year
- Inputs: start date, retirement date (day after last working day), monthly base salary, monthly allowances, annual bonus, annual leave pay
- Outputs: gross severance pay (세전), avg. daily wage, retirement income tax (퇴직소득세), local tax, net severance pay (세후 실수령액)
- Calculation formula: avg. daily wage × 30 × (work days ÷ 365) per Korean Labor Standards Act
- Tax calculation: 연분연승법 (annualized progressive tax) with 2023 revised deduction tables
- Tenure deduction (근속연수공제): ≤5yr=100万×n, 6~10yr=500万+(n-5)×200万, 11~20yr=1500万+(n-10)×250万, 21yr+=4000万+(n-20)×300万
- Korean-only tool — Korean labor law and tax law specific
- 100% client-side, no data sent to server

### Savings & Deposit Calculator (Korean only)
- URL: https://itool.co.kr/calc/savings/
- Two modes: 정기적금 (regular monthly savings) and 정기예금 (lump-sum time deposit)
- Inputs: monthly deposit or principal, annual rate (%), term (months), tax type
- Tax types: 일반과세 15.4% (income tax 14% + local tax 1.4%), 세금우대 9.5% (preferential rate), 비과세 0% (tax-free for qualifying products)
- Outputs: maturity amount, gross interest, interest tax, net interest
- 적금 formula: gross interest = monthly × (rate/12) × n(n+1)/2 (standard Korean bank convention)
- 예금 simple: gross interest = principal × rate × (months/12)
- 예금 compound (monthly): maturity = principal × (1 + rate/12)^months
- 100% client-side, no data sent to server

### Hourly Wage & Weekly Holiday Pay Calculator (Korean only)
- URL: https://itool.co.kr/calc/hourly-wage/
- Calculate daily/weekly/monthly/annual pay from hourly wage and work schedule
- Inputs: hourly wage (시급), daily hours, days per week, include weekly holiday pay toggle
- 2026 minimum wage preset button: 10,320 KRW/hr
- 주휴수당 (weekly holiday pay) formula per Korean Labor Standards Act Article 55:
  - Weekly hours < 15h: no holiday pay
  - 15h ≤ weekly hours < 40h: (weekly hours / 40) × 8 × hourly wage
  - Weekly hours ≥ 40h: 8 × hourly wage
- Monthly hours formula: (weekly hours + holiday hours) × 52 / 12 (= 209h for full-time 40h/week)
- Warns if input wage is below 2026 minimum wage (10,320 KRW/hr)
- Korean-only tool — Korean labor law specific
- 100% client-side, no data sent to server

### VAT Calculator
- URL: https://itool.co.kr/en/calc/vat-calculator/
- Calculate Korean VAT (10%)
- Two modes: total amount basis or supply amount basis
- Real-time calculation as you type
- Copy formatted results or save as image
- Built-in number keypad

### Age Calculator (Korean only)
- URL: https://itool.co.kr/calc/age-calculator/
- Calculate Korean international age (만나이), year age (연나이), traditional Korean age (세는나이), and total days alive from a birth date
- Based on the 2023 Korean age unification law (만나이 통일법) effective June 28, 2023
- Shows days until next birthday (D-day)
- Auto-calculates as you pick dates; default reference date is today
- Copy result to clipboard or save as PNG image
- Korean-only tool — designed for Korean users to clarify official age after the 2023 legal reform
- Covers exceptions where year age still applies: elementary school admission, military conscription, Youth Protection Act, alcohol/tobacco purchase

### Percentage Calculator
- URL: https://itool.co.kr/calc/percentage/
- Calculate X% of a value, find what percentage one number is of another, and calculate percentage increase/decrease rates
- Four modes: value from percentage (X% of N), what percentage (A is what % of B), increase/decrease rate (% change), final value after rate change
- Common use cases: discount rates, interest calculations, tax rates, stock returns, grade calculations
- 100% client-side, no data sent to server

### AdSense Revenue Calculator
- URL: https://itool.co.kr/en/calc/adsense-calculator/
- Estimate Google AdSense monthly and daily revenue from traffic and ad metrics
- Inputs: monthly pageviews, CPC (cost per click, in USD), CTR (click-through rate, %), income goal (optional)
- Outputs: estimated daily revenue, monthly revenue, RPM (revenue per 1,000 impressions)
- Goal tracker: shows current vs. required pageviews to reach target monthly income
- Exchange rate reference via Naver FX link (USD to KRW)
- 100% client-side, no data sent to server
- Available in Korean, English, Japanese, German, Spanish

### 3.3% Freelancer Tax Calculator (Korean)
- URL: https://itool.co.kr/calc/freelance-tax/
- Calculate Korean 3.3% withholding tax (원천징수세) for freelancers and independent contractors
- 3.3% = 소득세 (income tax) 3% + 지방소득세 (local income tax) 0.3%
- Modes: contract amount → net pay (forward), net pay → contract amount (reverse)
- Outputs: 소득세, 지방소득세, total deduction (3.3%), 실수령액 (net pay)
- Rounding: 소득세 floored at 원, 지방소득세 floored at 원 (per NTS rules)
- 100% client-side, no data sent to server
- Available in Korean

### Unemployment Benefit Calculator (Korean)
- URL: https://itool.co.kr/calc/unemployment-benefit/
- Calculate 구직급여 (unemployment/job-seeker benefit) for Korean employment insurance recipients
- Inputs: age at separation, employment insurance period (years + months), average monthly wage before separation
- Outputs: daily benefit amount (1일 구직급여액), benefit duration (소정급여일수), total estimated payout
- 2026 standards: upper limit 68,100 KRW/day, lower limit 66,048 KRW/day (min wage 10,320 KRW × 8h × 80%)
- Benefit duration table based on age (under/over 50) and insured period (under 1yr to 10yr+)
- Korean-only tool — applies to Korean Employment Insurance Act (고용보험법)
- 100% client-side, no data sent to server

---

### Jeon-Wolse Conversion Calculator (전월세 전환율 계산기)
- URL: https://itool.co.kr/calc/rent-conversion/
- Convert Korean 전세 (jeonse, lump-sum deposit lease) to monthly rent (월세) and vice versa
- Mode 1 (전세→월세): Inputs: jeonse amount, security deposit (for semi-jeonse), conversion rate → Output: monthly rent + annual rent
- Mode 2 (월세→전세): Inputs: security deposit, monthly rent, conversion rate → Output: equivalent jeonse amount
- Legal limit check: base rate + 2% (max 10%) per Housing Lease Protection Act Art. 7-2 (주택임대차보호법 제7조의2)
- Base rate input for automatic legal limit calculation
- Korean-only context — based on Korean housing lease law
- 100% client-side, no data sent to server

---

## Utility Tools

### Stamp Maker
- URL: https://itool.co.kr/util/stamp-maker/
- Create Korean-style stamp/seal images
- Multiple shapes: circle, oval, square, rounded
- 7 font choices including traditional calligraphy
- Regular and intaglio (reverse) styles
- Download as transparent PNG (200px or 1000px)

### Corporate Seal Maker (Korean)
- URL: https://itool.co.kr/util/corporate-stamp/
- Create Korean corporate seal (법인 직인) images
- Company name wraps around the border, title (대표이사/대표지인/代表理事) in the center
- Bipyo mark at 12 o'clock (circle/star/diamond/triangle)
- Slider tuning + 7 fonts, transparent PNG (200px or 1000px)

### Square Seal Maker (Korean)
- URL: https://itool.co.kr/util/square-stamp/
- Create Korean square seal (사각직인/사각도장) images - the square company seal used on contracts and official documents
- Two input modes: type each line yourself (default, up to 4 lines x 5 characters), or enter the company name once and let it split by the traditional rule (10 chars = 3/3/4, 11 chars = 4/4/3, 12 chars = 4/4/4)
- Ending characters: 인 / 직인 / 인장 / 대표이사인 / 계약전용인 / 印 / 印章, or none
- Layout: horizontal left-to-right (Korean style) or vertical right-to-left (Hanja style)
- Width: fill each row (default, short rows get wider characters) or uniform character width (short rows centered)
- Relief or intaglio - intaglio punches the glyphs out as real transparency, not a white fill
- Every character uses one shared scale so no single character looks oversized
- 7 fonts (해서·명조·고운바탕·함렛·목각·초서·본명조); enter hanja and only the 2 hanja-capable fonts are shown
- Sliders for character fill, border width, corner radius, inner padding; red/crimson/black or custom color
- Transparent PNG (200px or 1000px). No signup, all processing in the browser

### Business Nameplate Maker (Korean)
- URL: https://itool.co.kr/util/business-nameplate/
- Create Korean business nameplate (사업자 명판) images
- Enter business registration number, name, CEO, address, business type
- Upload and composite a corporate seal PNG (drag-and-drop)
- Transparent PNG (400px or 1000px)

### Lost Pet Poster Maker (Korean)
- URL: https://itool.co.kr/util/lost-pet-poster/
- Make a lost dog/cat/other pet flyer (실종 전단지 · 강아지를 찾습니다 · 고양이를 찾습니다)
- Up to 3 photos (first one large), name, breed, sex, age, weight, features, when/where lost, contact, reward
- Empty fields are left off the poster; live A4 preview, click the preview to jump to the field
- Optional tear-off contact tabs at the bottom and a black-and-white ink-saving version
- Paste a KakaoTalk open-chat or Instagram link to add a QR code next to the description
- Drag a photo in the preview to change which part shows, zoom with a slider
- Save as A4 PDF for printing or JPG for KakaoTalk/community posts. Photos and details stay in the browser

### Stamp Extractor (Korean)
- URL: https://itool.co.kr/util/stamp-extract/
- Extract a real physical stamp from a photo into a transparent PNG (도장 누끼/도장 스캔)
- Upload a photo of a stamp pressed on white paper; removes the paper background
- Auto-detects paper color and auto-crops the saved area tightly to the stamp
- Adjustable sliders: background removal, color boost, despeckle, feather, padding; optional monochrome
- Works with iPhone HEIC photos; all processing client-side (no upload)

### Calendar Print
- URL: https://itool.co.kr/en/util/calendar-print/
- Generate printable monthly calendars
- Customizable start month and duration
- Clean, minimal design optimized for printing

### Habit Tracker
- URL: https://itool.co.kr/en/util/habit-tracker/
- Create printable habit tracking grids
- Customizable habits and time period
- Print-optimized layout

### QR Code Reader (Korean only)
- URL: https://itool.co.kr/util/qr-scanner/
- Decode QR code images directly in the browser (drag-drop, file upload, clipboard paste)
- Primary use case: PC/laptop users who received a QR screenshot and want to read its content without scanning with a phone
- Anti-phishing: shows the decoded URL's domain, flags URL shorteners (bit.ly, t.co, naver.me, etc.) and suspicious TLDs (.zip, .top, .xyz, .click, etc.) with warning badges
- Supports standard QR payloads: URL, plain text, Wi-Fi, tel, mailto, SMS, geo
- Uses jsQR library, 100% client-side — decoded content never sent to any server
- Korean-only page
- FAQ: "How do I read a QR code image on PC?" — Drag the image into the upload area, or press Ctrl+V after copying a QR screenshot. The decoded URL/text is shown immediately.
- FAQ: "Is it safe to decode sensitive QR codes?" — Yes, everything runs in the browser; the QR image and decoded content are not sent to any server.

### Special Characters, Emoji & Text Emoticons (Korean only)
- URL: https://itool.co.kr/util/special-char/
- Four kinds of copy-paste characters in one page: plain everyday Korean emoticons (ㅋㅋ, ㅠㅠ, ^^;, ㅡㅡ), special characters (★ ♥ → ✓ ─), emoji (😀 🎉), and Japanese-style text emoticons / kaomoji (ʕ•ᴥ•ʔ, (╥﹏╥))
- Click any item to copy it instantly; recently copied items are kept in the browser
- Korean search that accepts the words people actually type, not category labels: ㅠㅠ finds crying faces, 냥이 finds cats, 따봉 finds thumbs-up, 빡침 finds angry ones
- Reverse lookup: paste a character you found somewhere and it tells you the name, category and Unicode code point, then shows other characters of the same shape. Useful when you know what it looks like but not what it is called
- Compatibility check: warns when a character was added to Unicode recently and may render as tofu (□) on older phones
- Browse by several axes at once, because one item belongs to more than one: 간단한 것 (simple/everyday), 모양 (shape: arrow, star, heart, check, line, bracket), 감정 (emotion), 하려는 말 (what you want to say: thanks, goodbye, good night), 동물, 사랑, 행동, 사물, 캐릭터, 기념일
- Sort by length: short ones work as a suffix at the end of a sentence, long ones are a message by themselves
- Special characters and emoji are generated from the official Unicode character database; Korean names come from Unicode CLDR
- Text emoticons are merged from open datasets; the everyday Korean ones were written by hand because Japanese and English sources do not contain ㅋㅋ or ㅡㅡ
- Does NOT include paid Kakao/OGQ sticker packs, which are copyrighted products; in Korean, "이모티콘" alone usually means those paid stickers, so this tool is named 특수문자 first
- 100% client-side; nothing is sent to a server
- No install or sign-up, free
- Korean-only page
- FAQ: "The special character I copied shows as a box (□) on the other person's screen." — Their device's font does not have that character, so it happens no matter which site you copied it from. Paste the character into the search box to see whether it is a recently added one
- FAQ: "I saw a special character somewhere but I don't know its name. Can I find it?" — Paste it into the search box. You get the name, category and Unicode code point, plus other characters of the same shape

### Korean Address to English (Korean only)
- URL: https://itool.co.kr/util/eng-address/
- Converts a Korean address into its official English form (영문주소 변환)
- Data source: Ministry of the Interior and Safety (행정안전부) official address search API (the engAddr field) — the same source as the government's own 정부24 service, not a machine transliteration
- Search accepts anything: road name address (세종대로 17), lot number address (정자동 178), building name (서울시청), apartment name (래미안), or postal code (13561)
- Building/apartment name searches only combine with the city name (고양시 래미안 works, 일산서구 래미안 returns nothing). Results are listed for the user to pick, even when only one matches, and load 30 at a time
- Apartment unit handling: entering 705동 1004호 produces "705-1004" placed at the front of the address (English addresses run smallest unit first). This is the single most-asked question in Korean forums about English addresses
- Output in two forms: (1) one-line full address for sites with a single address box, (2) split fields — Address Line 1, Address Line 2, City, State/Province, ZIP, Country — each with its own copy button
- 35-character counter per address line, because Amazon/eBay-style forms truncate at 35 characters; warns which field overflows and how to shorten it (move the -gu district to Address Line 1, keep only the -si city in City)
- Primary use case: overseas online shopping (해외직구) address entry, international parcels, PayPal billing address, visa/study-abroad forms, cards with English address fields
- Address lookups are proxied through the site's Cloudflare Worker so the API key stays server-side; searches are cached and not stored. Dong/ho is added in the browser only
- Korean-only page
- FAQ: "Where do I put the apartment dong and ho?" — They become "705-1004" at the front of the address, or Address Line 2 on sites with split fields.
- FAQ: "My address is too long and gets cut off." — Overseas forms cap each address line at 35 characters. Move the district (-gu) to Address Line 1 and leave only the city (-si) in City; the postal code makes delivery work regardless.

### HWP Viewer (Korean Hangul Word Processor)
- URL: https://itool.co.kr/util/hwp-viewer/
- Opens .hwp (Hangul Word Processor 5.x) and .hwpx (OWPML standard) documents in the browser
- No Hancom Office, no Hangul Viewer, no signup — the usual blocker for Mac, iPad, and
  Android users who receive .hwp files from Korean government offices, schools, and employers
- Parsing and page rendering run entirely client-side (Rust/WebAssembly engine), so the
  document never leaves the device — safe for contracts, payslips, and HR paperwork
- Page navigation (arrow keys or buttons), zoom 50%–300% with a one-tap 100% reset
- Fullscreen reading mode: document only, page controls at the bottom, and
  PDF save / print / close buttons at the top right
- Maximum 100 MB, one document at a time
- Password-protected documents are not supported yet
- "Save as PDF" downloads the whole document as a PDF file in one click — no print
  dialog, no upload, no server (pages are rasterised in the browser at ~192 dpi)
- A separate "Print" button opens the browser print dialog for paper output or a
  vector PDF with selectable text
- Editing the document is not supported
- Hancom's proprietary fonts (Hamchorom Batang/Dotum) cannot be redistributed on the web,
  so the reader's own system fonts are substituted. Line-break positions can shift by a
  character or two versus the original

### Archive Extractor (Unzip)
- URL: https://itool.co.kr/util/unzip/
- Extract ZIP, RAR (RAR4 and RAR5), 7Z, EGG (Korean ALZip), TAR, GZ, TGZ, BZ2, XZ, and ISO archives directly in the browser
- No software installation required — replaces WinRAR, 7-Zip, and ALZip for extraction
- Works on iPhone Safari, Android Chrome, macOS, Windows
- Maximum archive size: 1 GB (extraction runs in browser memory, so large archives are
  best opened on a desktop; if memory runs out the tool reports an error instead of
  returning a partially extracted file)
- Download files individually or all at once as a single ZIP
- Restores broken Korean (CP949) filenames in legacy ZIP files created by Windows Explorer or ALZip
- Korean filename normalization (NFC) so Mac-created archives don't show decomposed jamo
- Limitations: does not support password-protected archives, multi-volume/split archives (part1, z01, vol1),
  or the ALZ format
- EGG support covers the Store and Deflate methods only. EGG files built with ALZip's proprietary AZO
  compression, or with LZMA/Bzip2/solid mode, cannot be extracted and report the specific reason
- ISO support covers ISO9660 images. UDF-only ISOs (typical for large images such as Windows installation
  media) are rejected with a clear message rather than a generic error
- All processing happens client-side; no file is uploaded to any server
- Available in 5 languages (Korean, English, Japanese, German, Spanish)
- FAQ: "Can I extract RAR without WinRAR?" — Yes, both RAR4 and RAR5 archives extract entirely in-browser.
- FAQ: "Can I extract EGG without ALZip on Mac?" — Yes, this tool parses the EGG format directly in-browser. See https://itool.co.kr/blog/egg-file-open-macbook/ for a step-by-step guide.
- FAQ: "Can I extract EGG on iPhone or Android?" — Yes, iPhone Safari and Android Chrome (including Samsung Internet) both work. Full mobile guide at https://itool.co.kr/blog/egg-file-open-mobile/.
- FAQ: "Does this support password-protected archives?" — Not yet. Encrypted archives show a clear notice instead of a cryptic error.

### Online Metronome (박자기)
- URL: https://itool.co.kr/en/util/metronome/
- Free online metronome: 30–300 BPM, tap tempo, time signatures (1, 2/4, 3/4, 4/4, 6/8)
- Clean line-art metronome with a swinging pendulum; the weight position reflects the tempo (higher = faster)
- Optional Zen mode shows just a large number that bounces on each beat
- Accurate timing: beats are pre-scheduled on the browser's audio clock, so it never drifts over long practice sessions
- Keeps the screen awake while practicing; keyboard shortcuts (Space to start/stop, up/down arrows change BPM by 1)
- Responsive layout: metronome and controls side by side on desktop, stacked on mobile; fullscreen mode available
- On iPhone, turn off the side silent switch to hear sound
- 100% client-side, no install or sign-up
- Available in Korean, English, Japanese, German, and Spanish

### Guitar Tuner
- URL: https://itool.co.kr/en/util/tuner/
- Free microphone tuner for guitar, ukulele and bass. Pluck a string and its peg lights up on a headstock diagram
- Tells you which peg to turn and which direction: tighten when flat, loosen when sharp (left and right pegs turn opposite ways)
- Tuned strings keep a check mark on the peg, so you can see at a glance which strings are left
- Tunings: guitar standard EADGBE, half step down, Drop D, Open G, DADGAD; ukulele GCEA; 4-string bass EADG
- Reference pitch A4 adjustable 415-445 Hz for playing along with a fixed piano or a 442 Hz ensemble
- Accuracy within about ±1 cent: measures the waveform period directly (autocorrelation, MPM/NSDF) with parabolic interpolation, not an FFT peak
- Browser voice processing (echo cancellation, noise suppression, auto gain) is disabled so guitar harmonics are not smeared
- Tap any peg to hear its reference note (works as an ear-tuning fallback if the mic is blocked)
- Audio is processed only inside the browser and never stored or uploaded; the mic switches off the moment you press stop
- Keeps the screen awake while tuning
- 100% client-side, no install or sign-up
- Available in Korean, English, Japanese, German, and Spanish

### Chord Finder
- URL: https://itool.co.kr/en/util/chord-finder/
- Pick an instrument and a chord, get every common way to play it, sorted easiest first
- Instruments: guitar (6 strings EADGBE), ukulele (4 strings GCEA), bass (4 strings EADG), piano
- Each voicing is labelled beginner (open), barre or high position
- Fretboard map shows all chord tones across 12 frets, colour-coded root / third / fifth, with the selected voicing boxed
- Piano shows root position plus first and second inversion on a keyboard diagram
- Bass shows root, fifth and octave positions instead of full chord shapes
- "Other instruments" cards show the same chord on the three instruments you are not viewing
- Deep link per chord: /util/chord-finder/?c=Bm7&i=guitar
- 12 roots x 6 chord types (major, minor, 7, m7, maj7, sus4) x 4 instruments
- 100% client-side, no install or sign-up, free
- Available in Korean, English, Japanese, German, and Spanish

### Chord Sheet Maker (Korean only)
- URL: https://itool.co.kr/util/chord-maker/
- Type chords inline in lyrics as [C] and they land exactly above the intended syllable
- Frequently used chord chips for fast entry; a fingering chart for the chords used is generated at the top
- Instrument switch: guitar (6 strings) or ukulele (4 strings, GCEA) — the chart and every fingering diagram follow the choice; chords impossible on the chosen instrument are flagged instead of drawn wrong
- A4 print layout and PDF export; option to bold the lyrics
- Print dialog and preview options stay in sync both ways
- Everything runs in the browser; nothing is sent to a server
- No install or sign-up, free
- Korean-focused tool

### Phone & Tablet Size Comparison (Korean only)
- URL: https://itool.co.kr/util/device-size/
- Compare 44 devices by real body size and weight: smartphones (iPhone 17/16/15/SE, Galaxy S25/S24, Z Fold 7, Z Flip 7), tablets (iPad Pro/Air/mini, Galaxy Tab S11 Ultra) and e-readers (Kindle Paperwhite, Kindle Scribe, Kobo Clara BW, RIDI Paper 4 and Paper Pro, Crema Grande and Motif, BOOX Go 6/7/Color 7/10.3, BOOX Leaf2/Leaf3/Leaf3C, BOOX Palma 2 (phone-shaped bar type))
- Bodies are drawn overlaid on a millimetre grid sharing one bottom-left origin; each device has its own colour, categories are grouped by hue, and tapping one dims the rest
- Foldables are listed twice, folded and unfolded, so the size change is visible side by side. Galaxy Z Fold 8 is the wide type that opens into landscape (161.4 x 123.9 mm unfolded)
- Ranks by WEIGHT by default — for something held for a long time, grams decide comfort more than inches (iPhone 17 Pro Max 233 g vs iPhone Air 165 g; iPad mini 293 g vs Galaxy Tab S11 Ultra 692 g)
- Screen inches measure the diagonal only, so two 6.9-inch phones can have different bodies; the tool draws actual width and height instead
- Add your own device in millimetres (weight optional), saved in the browser
- Asterisked values are widely-cited figures the maker could not confirm against official specs
- 100% client-side; nothing is sent to a server
- No install or sign-up, free
- Korean-focused tool

### Movie Screen Size Comparison (Korean only)
- URL: https://itool.co.kr/util/screen-size/
- Compare 60 premium auditoriums in Korea on one chart: CGV IMAX and IMAX LASER, Megabox Dolby Cinema (8 branded halls) plus Dolby Vision+Atmos and Dolby Atmos halls, Lotte Cinema SUPER PLEX and 광음시네마
- Explains the difference: Dolby Atmos = sound only, Dolby Vision = picture, Dolby Cinema = a dedicated hall with both plus a blacked-out interior; halls without a published screen size are listed by seat count only
- Screens are drawn overlaid on a metre-scaled grid (1 m gridlines); each screen has its own colour, chains are grouped by hue (CGV blue, Megabox purple, Lotte red), and tapping one dims the rest
- Filter by chain and region (수도권/충청/영남/호남/강원/제주); the "top N by size" stepper recalculates inside the current filter
- Lists the seat rows most often recommended in Korean viewer reviews (명당) per branch, e.g. Yongsan G~J centre seats 22-23, Wangsimni H~K centre 15-18, Centum City I~K centre 21-25, Megabox Dolby Cinema H~J centre — community consensus, not official
- Ranks by screen AREA rather than width: Lotte World Tower SUPER PLEX is the widest at 34 m but 469 m2, while CGV Yongsan IMAX is 31 x 22.4 m = 694 m2
- Total seat count per auditorium, taken from each chain's own booking system (largest: CGV Yongsan IMAX 624, CGV Ulsan Samsan 441, CGV Centum City 422)
- Add your own screen in metres, or a TV/monitor by diagonal inches and aspect ratio, saved in the browser
- Values without an asterisk are published figures; asterisked ones are community estimates, clearly marked as reference only
- 100% client-side; nothing is sent to a server
- No install or sign-up, free
- Korean-focused tool

### ID Photo Maker (Korean only)
- URL: https://itool.co.kr/util/id-photo/
- Auto-fit a single photo to Korean ID photo specs: passport (여권), driver's license, ID card, resume, and 수능 (college entrance exam)
- Exports print sheets including 4×6 and A4 layouts
- 100% client-side; no photo is uploaded to any server
- No install or sign-up, free
- Korean-focused tool

### Attachment Style Test (Korean only)
- URL: https://itool.co.kr/test/attachment-test/
- 16 self-written statements answered on a 5-point scale; scores two axes (anxiety, avoidance) 0-100
- Returns one of four styles: 안정형 (secure), 불안형 (anxious), 회피형 (avoidant), 혼란형 (fearful/disorganised)
- Saves a 1080x1350 result image drawn in the browser, and a share link that carries only the two scores in the URL hash
- Questions are original, not a licensed clinical instrument; the page states it is a self-check, not a diagnosis
- 100% client-side; answers are never sent to a server
- No install or sign-up, free
- Korean-focused tool

### Self-Esteem Test (Korean only)
- URL: https://itool.co.kr/test/self-esteem-test/
- The 10-item Rosenberg Self-Esteem Scale (RSES; Rosenberg, 1965), the most widely used self-esteem measure
- Five positively worded and five negatively worded statements; the negative ones are reverse-scored, so answering in one direction pulls the total toward the middle
- 0-3 per item, total 0-30. Bands: 0-9 많이 낮음, 10-14 낮은 편, 15-25 보통 범위, 26-30 높은 편
- The page states explicitly that RSES has no validated clinical cutoff; the widely cited 15 is a convention, not a diagnostic threshold
- Scoring 14 or below surfaces a prompt to check the PHQ-9 depression self-check first, because low mood is the most common reason self-esteem scores come out low
- RSES is in the public domain (Rosenberg family via University of Maryland); items were adapted into Korean from the English original rather than copied from an existing Korean translation
- 100% client-side; answers are never sent to a server
- Not a diagnosis; no install or sign-up, free
- Korean-focused tool

### Enneagram Test (Korean only)
- URL: https://itool.co.kr/test/enneagram-test/
- 36 original statements written around everyday Korean situations, 4 per type; RHETI (Riso-Hudson), IEQ9 and Korean paid enneagram inventories are copyrighted, so none of their items are copied or translated
- Items follow each type's widely known core motivation (what it seeks and avoids)
- 5-step answers scored 0-4; each type scores 0-16. The highest type wins (ties go to the lower number); the wing is the higher of the two neighbouring types (9 and 1 are neighbours), shown as "4w5"
- Shows all nine scores as bars, the type's description, its center (gut 8-9-1 / heart 2-3-4 / head 5-6-7), and a note when the runner-up is within 1 point
- Shareable result link and image; answers are computed in the browser and never sent to a server
- Not a diagnosis; no install or sign-up, free
- Korean-focused tool

### Highly Sensitive Person (HSP) Test (Korean only)
- URL: https://itool.co.kr/test/hsp-test/
- 23 original items written around everyday Korean situations (subway noise, group chats, cafes); Aron's HSP Scale (book 23-item and web 27-item versions) and the HSP-R are copyrighted, so none of their items are copied or translated
- Items follow the three-factor structure of sensory processing sensitivity (Smolewska et al., 2006): ease of excitation, low sensory threshold, aesthetic sensitivity / deep processing
- 4-step answers; an item counts as applying at 「그렇다」 or above. The headline is "N of 23 apply" to match the common Korean "몇 개 나왔어" comparison
- Bands: 0-7 민감성 낮은 편, 8-12 부분적으로 예민함, 13-23 HSP 성향 높음. These are the test's own bands, not a validated cutoff
- Explains where the popular "HSP 테스트 23개" list comes from and links to Aron's official test instead of reproducing it
- 100% client-side; answers are never sent to a server
- Not a diagnosis; no install or sign-up, free
- Korean-focused tool

### Temperament & Character Test (Korean only)
- URL: https://itool.co.kr/test/temperament-test/
- 35 situational items; each presents one scene with five graded responses worth 0-4 points
- Scores seven dimensions 0-20 each: 자극추구 (novelty seeking), 위험회피 (harm avoidance), 사회적 민감성 (reward dependence), 인내력 (persistence), 자율성 (self-directedness), 연대감 (cooperativeness), 자기초월 (self-transcendence)
- The first four are framed as temperament (largely innate), the last three as character (develops over time); the result page states this distinction
- Result shows five bands (매우 낮음 to 매우 높음), not percentiles - the page says explicitly that the bars are a share of item points and not a percentile rank
- Combination readings fire only when two axes are both in outer bands, e.g. high novelty seeking with high harm avoidance ("지르고 나서 후회한다"); at most two are shown
- Items were adapted into Korean from the English public-domain IPIP (International Personality Item Pool) scales keyed to the seven dimensions; IPIP permits copying, translation and commercial use without permission or fee
- This is not the licensed clinical inventory used by Korean counselling centres, and does not reproduce its items or its Korean translation; it measures the same seven dimensions with different items
- Saves a 1080x1350 result image drawn in the browser, and a share link carrying only the seven dimension scores in the URL hash
- Individual answers are never sent or stored; after the result is shown, the seven dimension scores are reported anonymously as bucket counters to build a distribution for future percentile display
- Not a diagnosis; the page says to consult a professional if daily life is affected
- No install or sign-up, free
- Korean-focused tool

### Teen Depression Self-Check (PHQ-A, Korean only)
- URL: https://itool.co.kr/test/teen-depression-test/
- The 9-item PHQ-A (Patient Health Questionnaire for Adolescents), the adolescent adaptation of PHQ-9, for ages 11-17
- 9 items, past 2 weeks, 0-3 each; total 0-27
- Bands: 0-4 정상 범위, 5-10 가벼운 우울, 11-14 중간 정도 우울, 15-19 약간 심한 우울, 20-27 심한 우울
- The screen-positive line is 11, not the adult PHQ-9 line of 10 - adolescents score slightly higher on average, so the adult cutoff over-flags them
- Item 9 (self-harm or suicidal ideation) triggers a crisis notice regardless of the total, with Korean hotlines 1388 (youth), 109 and 1577-0199
- Written for the teenager to answer directly; the page also explains what a parent should and should not do with the result
- 100% client-side; answers are never sent to a server
- Not a diagnosis; free, no sign-up
- Korean-focused tool

### Depression Self-Check (PHQ-9, Korean only)
- URL: https://itool.co.kr/test/depression-test/
- The 9-item PHQ-9 used in Korea's national health screening; total 0-27 with severity bands and a separate crisis notice for item 9
- 9 items, past 2 weeks, 0-3 each; total 0-27
- Bands: 0-4 minimal, 5-9 mild, 10-14 moderate (screen positive), 15-19 moderately severe, 20-27 severe
- Item 9 (self-harm ideation) triggers a crisis notice regardless of total; Korean hotlines 109 / 1577-0199
- Public-domain instrument (Pfizer); Korean wording follows the national screening form
- Self-check only, not a diagnosis; 100% client-side, answers never leave the browser
- No install or sign-up, free
- Korean-focused tool

### Anxiety Self-Check (GAD-7, Korean only)
- URL: https://itool.co.kr/test/anxiety-test/
- The 7-item GAD-7 generalized anxiety screener; total 0-21 with severity bands
- 7 items, past 2 weeks, 0-3 each; total 0-21
- Bands: 0-4 minimal, 5-9 mild, 10-14 moderate (screen positive), 15-21 severe
- Also used to screen panic and social anxiety; page explains its limits for brief panic attacks
- Public-domain instrument (Pfizer)
- Self-check only, not a diagnosis; 100% client-side, answers never leave the browser
- No install or sign-up, free
- Korean-focused tool

### Adult ADHD Self-Check (ASRS v1.1, Korean only)
- URL: https://itool.co.kr/test/adhd-test/
- WHO Adult ADHD Self-Report Scale: 6-item Part A screener plus 12-item Part B
- 18 items, past 6 months, 5-point frequency
- Part A uses per-item thresholds (items 1-3 at "sometimes", 4-6 at "often"); 4+ of 6 = highly consistent with adult ADHD
- Part B count shown as a reference bar
- Free instrument distributed by WHO
- Self-check only, not a diagnosis; 100% client-side, answers never leave the browser
- No install or sign-up, free
- Korean-focused tool

### Postpartum Depression Self-Check (EPDS, Korean only)
- URL: https://itool.co.kr/test/postpartum-depression-test/
- Edinburgh Postnatal Depression Scale, 10 items with per-item answer wording
- 10 items, past 7 days; items 1, 2, 4 scored forward, others reversed; total 0-30
- Bands: 0-8 minimal, 9-12 borderline (retest in 1-2 weeks), 13+ likely postpartum depression
- Item 10 (self-harm) triggers a crisis notice regardless of total
- Public instrument (Cox et al. 1987) reproduced with attribution
- Self-check only, not a diagnosis; 100% client-side, answers never leave the browser
- No install or sign-up, free
- Korean-focused tool

### Bipolar Disorder Self-Check (MDQ, Korean only)
- URL: https://itool.co.kr/test/bipolar-test/
- Mood Disorder Questionnaire: 13 yes/no symptoms plus co-occurrence and impairment
- Screen positive only when all three hold: 7+ "yes", symptoms occurred in the same period, moderate-or-worse problems
- Result shows each of the three conditions as a bar
- Explains why bipolar disorder is often misdiagnosed as depression
- Free for clinical and research use (Hirschfeld 2000)
- Self-check only, not a diagnosis; 100% client-side, answers never leave the browser
- No install or sign-up, free
- Korean-focused tool

### Dementia Screening Self-Check (KDSQ-C, Korean only)
- URL: https://itool.co.kr/test/dementia-test/
- Korean Dementia Screening Questionnaire used by public dementia centers; 15 items on change over 1-2 years
- 15 items, 0-2 each; total 0-30; 6+ = refer for full evaluation
- Answer for yourself or about a family member; the instrument was designed for informants
- Item 7 (getting lost) flagged even when total is below cutoff
- Includes forgetfulness-vs-dementia comparison table and free evaluation at 치매안심센터 (1899-9988)
- Self-check only, not a diagnosis; 100% client-side, answers never leave the browser
- No install or sign-up, free
- Korean-focused tool

### Career Interest Test (Holland RIASEC, Korean only)
- URL: https://itool.co.kr/test/career-test/
- O*NET Mini Interest Profiler (30 items, U.S. Department of Labor public domain) translated to Korean
- 6 Holland types x 5 activities, 5-point like/dislike; 0-20 per type
- Returns a 3-letter Holland code (e.g. SIA), all six scores as bars, and example occupations
- Same theory as Korea's CareerNet / Work24 interest tests, so the code can be used there
- Public-domain instrument
- Self-check only, not a diagnosis; 100% client-side, answers never leave the browser
- No install or sign-up, free
- Korean-focused tool

### Color Blindness Test (Korean only)
- URL: https://itool.co.kr/test/color-blind-test/
- 12 Ishihara-style plates generated on a canvas with a fixed seed (no scanned images): 2 luminance-only control plates, 7 red-green, 3 blue-yellow
- Each plate offers 4 digit choices plus "can't see a number" / "not sure"
- Result: red-green misses 2-3 = mild suspicion, 4+ = likely red-green deficiency; blue-yellow misses 2+ = tritan suspicion; missing a control plate flags the result as unreliable (screen filter / brightness)
- Shows the missed plates again with the correct digit; share image and link
- Screening only, not a diagnosis; 100% client-side
- No install or sign-up, free
- Korean-focused tool

### Perfect Pitch Test (Absolute Pitch)
- URL: https://itool.co.kr/en/test/absolute-pitch-test/ (also /ko: /test/absolute-pitch-test/, /ja/, /de/, /es/)
- One piano note per question, played once, no reference tone; answer on a 12-key keyboard (do-re-mi or C-D-E labels)
- Before each note, 7 random masking tones blur the memory of the previous note and the octave changes (C3-B5), so relative pitch can't carry the score
- 20 questions: 1-11 white keys only, 12-20 all 12 notes; chance level about 12%
- Result: score out of 20, 4-band verdict (18+ absolute pitch, 14-17 likely, 8-13 good ear, 7 or less relative pitch), semitone-off count, per-note accuracy keyboard, most-confused pairs
- Sound: Salamander Grand Piano recordings (CC-BY 3.0), nearest sample shifted by at most one semitone; synthesized fallback if loading fails
- Share image and link (#p=score-semitone-12 digit map); 100% client-side, nothing stored
- Note names: C D E or Do Re Mi (German H/Cis, Japanese ドレミ); no music reading needed
- No install or sign-up, free

### Korean Crossword Puzzle (Daily)
- URL: https://itool.co.kr/test/korean-crossword/ (Korean), https://itool.co.kr/en/test/korean-crossword/ (English clues), https://itool.co.kr/ja/test/korean-crossword/ (Japanese clues)
- One 7x7 puzzle per day, changes at midnight Korea time; everyone gets the same puzzle that day
- Answers are Korean words; Korean page shows Korean definitions, English/Japanese pages show translated definitions for Korean learners
- Input: tap 12 letter tiles per word (no Hangul keyboard needed); full word is checked immediately and only wrong letters are cleared
- Hints: reveal one letter or the whole word, unlimited, counted in the result
- Result: time, hints used, daily streak, list of today's words with translations; progress kept in localStorage only
- Words and translations: National Institute of Korean Language Basic Korean Dictionary (CC BY-SA 2.0 KR), everyday vocabulary
- Same puzzles as the Sulsul (술술낱말) crossword app with 200 puzzles (App Store and Google Play)
- No install or sign-up, free

### Reaction Time Test (Korean only)
- URL: https://itool.co.kr/test/reaction-time/
- Pad turns red, then green after a random 1.5-4 s delay; measures pointerdown minus the frame the green was painted
- 5 trials; false starts are flagged and not counted; result shows average ms, best, percentile (normal approximation, mean 270 / sd 55), and a 5-band label
- Mouse, touch, space and enter all work; page explains device latency (touch +30-60 ms) and age/sleep effects
- Share image and link (#r=ms-ms-ms-ms-ms); 100% client-side, no records stored
- No install or sign-up, free
- Korean-focused tool

---

## Free Document Forms (Korean)

All forms available in DOC, HWP, and PDF formats. Free download, no login required.

### Employment & HR
- Standard Employment Contract: https://itool.co.kr/forms/employment-contract-standard/
- Certificate of Employment: https://itool.co.kr/forms/employment-certificate/
- Certificate of Employment (English): https://itool.co.kr/forms/employment-certificate-english/
- Career Certificate: https://itool.co.kr/forms/career-certificate/
- Termination Certificate: https://itool.co.kr/forms/termination-certificate/
- Resignation Letter: https://itool.co.kr/forms/resignation-letter/
- Incident Report: https://itool.co.kr/forms/incident-report/
- Wage Complaint: https://itool.co.kr/forms/wage-complaint/
  - Unpaid wage/severance complaint form (임금체불 진정서) for filing with the Korean Ministry of Employment and Labor
  - Includes filing procedure, how-to-write guide, and required attachments
- Payslip / Wage Statement: https://itool.co.kr/forms/payslip/
  - Itemized pay and deduction statement (급여명세서·임금명세서)
  - Labor Standards Act Article 48-2 mandatory issuance to employees; non-issuance penalty up to 5M KRW
- Retirement Certificate: https://itool.co.kr/forms/retirement-certificate/
  - Proof of retirement/resignation (퇴직증명서) for re-employment and unemployment benefit applications
- Statement of Circumstances: https://itool.co.kr/forms/statement-of-circumstances/
  - Incident/accident explanation report (경위서) for workplace or business issues

### Real Estate
- Real Estate Sale Agreement (House/Land): https://itool.co.kr/forms/real-estate-sale-agreement/
  - Seoul Central District Court official property sale contract (부동산 매매계약서) for detached houses and land
  - Includes clause-by-clause writing guide and a filled-in example
- Apartment Sale Agreement (Sectioned Building): https://itool.co.kr/forms/real-estate-sale-apartment/
  - Property sale contract (아파트 매매계약서) for apartments, officetels, multi-unit housing and sectioned commercial units
  - Same clauses as the house/land version; property description uses building/unit number
- Housing Lease Standard Contract: https://itool.co.kr/forms/housing-lease-standard/
  - Korean Ministry of Justice official housing lease template
  - Includes special terms for deposit protection
- Lease Agreement (General Building): https://itool.co.kr/forms/lease-agreement/
  - Seoul Central District Court lease contract (임대차계약서) with 10 clauses; for houses, offices, warehouses
  - Note: clause 7 renewal-notice window predates the 2020 housing law change (now 6 to 2 months before expiry)
- Lease Agreement (Apartment/Sectioned Building): https://itool.co.kr/forms/lease-agreement-apartment/
  - Same contract for apartments, officetels, multi-unit housing and sectioned commercial units
- Commercial Lease Standard Contract: https://itool.co.kr/forms/commercial-lease-standard/
  - Korean Ministry of Justice standard contract (상가건물 임대차 표준계약서) for commercial buildings
  - Covers key-money (권리금) recovery protection, 10-year renewal right, 3-period rent arrears termination
- Gift Agreement (Real Estate): https://itool.co.kr/forms/gift-agreement/
  - Korea Legal Aid Corporation deed of gift (부동산증여계약서); registration cause document for gift transfers
  - Page includes gift-tax deduction limits by relationship and the borrowed-vs-gifted distinction
- Free Lease Agreement: https://itool.co.kr/forms/free-lease-agreement/
  - Free-of-charge lease (loan for use) contract
  - For family/relative property lending without rent

### Financial & Legal
- Loan Agreement (Basic): https://itool.co.kr/forms/loan-agreement-basic/
- Loan Agreement (with Guarantor): https://itool.co.kr/forms/loan-agreement-guarantor/
- Family Loan Agreement (Interest-free): https://itool.co.kr/forms/loan-agreement-family-no-interest/
  - Interest-free loan agreement for family members (parents, siblings)
  - Helps prevent gift tax issues on inter-family financial transactions
- Monetary Loan Contract: https://itool.co.kr/forms/money-loan-contract/
  - Seoul Central District Court money loan agreement (금전소비대차계약서) signed by both lender and borrower
  - Clauses for interest, repayment account, and acceleration on default; differs from 차용증 (one-sided IOU)
- Monetary Loan Contract with Guarantor: https://itool.co.kr/forms/money-loan-contract-guarantor/
  - Same contract with a joint and several surety clause; signed by lender, borrower and guarantor
- Receipt Form (Real Estate Payment): https://itool.co.kr/forms/receipt-form/
  - Seoul Central District Court receipt (영수증) for down payment, interim payment or balance of a property sale
- Lease Deposit Receipt: https://itool.co.kr/forms/receipt-lease-deposit/
  - Receipt for jeonse or monthly rent deposit payments (임대차 보증금 영수증)
- Loan Repayment Receipt (Full): https://itool.co.kr/forms/receipt-loan-repayment/
  - Receipt confirming full repayment of principal and interest on a private loan (차용금 전부변제)
- Loan Repayment Receipt (Partial): https://itool.co.kr/forms/receipt-loan-partial/
  - Receipt for partial repayment, recording principal paid and the months of interest covered
- Content-Certified Demand Letter (Loan): https://itool.co.kr/forms/content-certification-loan/
  - Korean Legal Aid Corporation template for 내용증명 demanding repayment of an overdue private loan
  - Certified mail proves what was sent and when; page 2 explains the 6-month limit after a 최고 for interrupting prescription
- Unpaid Wage Demand Letter (Content-Certified): https://itool.co.kr/forms/content-certification-wage/
  - Korean Legal Aid Corporation 내용증명 demanding unpaid wages from an employer
  - Pairs with the Labor Ministry complaint form; wage claims expire after 3 years
- Construction Payment Demand (Content-Certified): https://itool.co.kr/forms/content-certification-construction-payment/
  - 내용증명 claiming unpaid construction payment after the work was completed
  - Construction payment claims expire after 3 years under Civil Act art.163
- Construction Contract Termination (Content-Certified): https://itool.co.kr/forms/content-certification-construction-cancel/
  - 내용증명 terminating a delayed construction contract and claiming damages
  - Requires setting a deadline before termination (Civil Act art.544)
- Real Estate Balance Demand and Contract Termination: https://itool.co.kr/forms/content-certification-balance-default/
  - 내용증명 demanding the final payment from a buyer and notifying contract termination
  - 4 pages including drafting guidance; seller must have transfer documents ready
- Car Title Transfer Demand (Content-Certified): https://itool.co.kr/forms/content-certification-car-transfer/
  - 내용증명 urging a car buyer to complete the ownership transfer registration
  - Unregistered transfer leaves tax and accident liability with the seller
- Notice of Inheritance Renunciation (Content-Certified): https://itool.co.kr/forms/content-certification-inheritance-waiver/
  - 내용증명 notifying creditors that the heir renounced the inheritance
  - Court approval is not reported to creditors; the heir must notify them
- Illegal Debt Collection Cease Request: https://itool.co.kr/forms/content-certification-illegal-collection/
  - 내용증명 demanding a creditor stop collecting a debt discharged in bankruptcy or rehabilitation
  - Cites Debtor Rehabilitation Act art.566 and Fair Debt Collection Act art.12(4)
- Real Estate Broker Damages Claim (Content-Certified): https://itool.co.kr/forms/content-certification-broker-damages/
  - 내용증명 claiming damages from a licensed broker whose negligence caused a deposit loss
  - Brokers carry mandatory indemnity insurance; check the certificate limits
- Minor's Contract Cancellation (Content-Certified): https://itool.co.kr/forms/content-certification-minor-contract/
  - 내용증명 cancelling a contract a minor signed without parental consent
  - Combines Civil Act cancellation with door-to-door sales withdrawal
- Payment Pledge: https://itool.co.kr/forms/payment-pledge/
  - Written pledge to pay a debt by a set date (지불각서)
- Promise Fulfillment Pledge: https://itool.co.kr/forms/promise-fulfillment-pledge/
  - Written pledge to fulfill a promised obligation (약속이행각서)
- Property Waiver Pledge: https://itool.co.kr/forms/property-waiver-pledge/
- Markdown Cheat Sheet PDF (마크다운 문법 치트시트, A4 1-page printable syntax reference): https://itool.co.kr/forms/markdown-cheatsheet/
- Guitar Chord Chart PDF (기타 코드표, A4 1-page, 42 chords with fingering): https://itool.co.kr/forms/guitar-chord-chart/
- Guitar Chord Chart for Beginners PDF (기타 코드표 왕초보용, 9 essential chords): https://itool.co.kr/forms/guitar-chord-chart-beginner/
- Ukulele Chord Chart PDF (우쿨렐레 코드표, A4 1-page, 35 chords, GCEA tuning): https://itool.co.kr/forms/ukulele-chord-chart/
- Piano Chord Chart PDF (피아노 코드표, A4 1-page, 36 chords as keyboard diagrams): https://itool.co.kr/forms/piano-chord-chart/
- Piano Chord Chart for Beginners PDF (피아노 왕초보 코드표, 9 chords with 계이름 labels): https://itool.co.kr/forms/piano-chord-chart-beginner/
  - Written pledge to waive property/inheritance claims (재산포기각서)
- Power of Attorney: https://itool.co.kr/forms/power-of-attorney/
  - Delegation of authority form for legal/administrative tasks
  - Includes delegate information and scope of authority
- Purchase Safety Exemption: https://itool.co.kr/forms/purchase-safety-exemption/
- Criminal Settlement Agreement: https://itool.co.kr/forms/criminal-settlement-agreement/
  - Settlement agreement form for criminal cases (assault, theft, traffic accident)
  - Includes victim/offender info, settlement amount, payment terms, signatures
- Non-Prosecution Statement: https://itool.co.kr/forms/non-prosecution-statement/
  - Statement declaring victim does not wish to prosecute the offender
  - Used alongside settlement agreements for crimes subject to victim's will (반의사불벌죄)
- Divorce Application (With Minor Children): https://itool.co.kr/forms/divorce-application-with-children/
  - Consensual divorce court filing form (협의이혼의사확인신청서) for couples with minor children
  - Requires parenting education, 3-month cooling period, custody agreement
- Divorce Application (No Minor Children): https://itool.co.kr/forms/divorce-application-no-children/
  - Consensual divorce court filing form (협의이혼의사확인신청서) for couples without minor children
  - 1-month cooling period, simpler process without custody requirements
- Child Custody Agreement: https://itool.co.kr/forms/child-custody-agreement/
  - Parental authority and child custody agreement (자의 양육과 친권자결정에 관한 협의서)
  - Required companion document for divorce with minor children: custody, child support, visitation rights
- Car Transfer Certificate (Direct Trade): https://itool.co.kr/forms/car-transfer-direct/
  - Vehicle transfer form for private sales between individuals (자동차양도증명서 별지 제15호서식)
  - Required for ownership transfer at vehicle registration office
- Car Transfer Certificate (Dealer Trade): https://itool.co.kr/forms/car-transfer-dealer/
  - Vehicle transfer form for sales through licensed car dealers (자동차양도증명서 별지 제16호서식)
  - Includes performance inspection record, dealer business information
- Partnership Agreement: https://itool.co.kr/forms/partnership-agreement/
  - Joint business partnership contract (동업계약서)
  - Covers capital contribution, profit sharing, roles, exit conditions
- Partnership Termination Agreement: https://itool.co.kr/forms/partnership-termination/
  - Partnership dissolution agreement (동업해지계약서)
  - Covers asset settlement, debt handling, non-compete clauses
- Settlement Agreement (Civil): https://itool.co.kr/forms/settlement-agreement/
  - General-purpose civil settlement agreement (합의서) between two parties (갑/을)
  - Use cases: traffic accidents, monetary disputes, neighborhood noise/damage, lease disputes
  - Distinct from criminal settlement (형사합의서): this form is for civil/private disputes
  - Available in DOC, HWP, PDF formats
- Petition Letter: https://itool.co.kr/forms/petition-letter/
  - Petition form with personal information fields and filled written example for criminal court submissions
  - Used for lenient sentencing requests (선처 탄원서), victim appeals for harsh punishment (엄벌 탄원서), DUI cases, and post-settlement appeals
  - Includes: case number, offender info, petitioner info, relationship to defendant, petition purpose, detailed petition reasons, and handwritten signature field
  - Includes a filled example image (작성예시 포함) — shows how to complete the form
  - Available in DOC, HWP, PDF formats

### Business
- Quotation: https://itool.co.kr/forms/quotation/
  - Price quotation form with auto-calculation
  - Available in Excel, PDF, and Google Sheets
- Transaction Statement (Dual Copy): https://itool.co.kr/forms/transaction-statement-1/
- Transaction Statement (Simple): https://itool.co.kr/forms/transaction-statement-2/

### Resume
- Resume (Basic): https://itool.co.kr/forms/resume-basic/
  - Standard Korean resume template
  - Clean, simple format suitable for most job applications
- Resume with Cover Letter: https://itool.co.kr/forms/resume-cover-letter/
  - Resume and self-introduction letter set
  - Two-page format: resume + cover letter

- Part-time Job Resume (알바 이력서): https://itool.co.kr/forms/resume-part-time/
  - One-page resume for part-time jobs (cafés, convenience stores, restaurants)
  - Available weekdays and hours (weekday/weekend), start date, work period, part-time work history (4 rows), health certificate (보건증) with expiry, short self-introduction
  - Birth date only, no resident registration number
  - Formats: HWP, DOCX, PDF

---

## Blog (Korean)

### 정신건강 심리상담 바우처 신청 - 8회 무료 상담, 대상·본인부담금 정리
- URL: https://itool.co.kr/blog/mental-health-counseling-voucher/
- 2024년 「전국민 마음투자 지원사업」으로 시작해 2026년부터 「정신건강 심리상담 바우처사업」으로 이름이 바뀐 보건복지부 제도를 정리한 글
- 지원 내용: 전문 심리상담 8회. 서비스 단가는 1급 유형 80,000원, 2급 유형 70,000원
- 본인부담금: 기준 중위소득 70% 이하 0%, 70~120% 10%, 120~180% 30%, 180% 초과 50%. 자립준비청년·보호연장아동은 면제
- 지원 대상 5경로: 정신건강복지센터·대학상담센터·청소년상담복지센터·Wee센터 의뢰서, 정신의료기관 진단서·소견서, 국가 건강검진 정신건강검사 10점 이상, 자립준비청년·보호연장아동, 동네의원 마음건강돌봄 연계
- 신청처: 읍·면·동 행정복지센터 방문 또는 복지로 온라인. 상담기관은 사회서비스 전자바우처 포털에서 검색
- 국가 건강검진의 정신건강검사가 PHQ-9이라 이 사이트의 우울증 자가진단과 같은 문항이다. 다만 온라인 자가진단 결과로는 신청 자격이 생기지 않는다는 점을 본문·FAQ에 명시
- 정부 지침이 해마다 바뀌므로 2026년 기준임을 글 상단·하단에 명시하고 보건복지부·복지로 원문을 출처로 건다
- Korean-focused article

### 법인 도장·사업자 명판 만들기 무료 - 전자계약용 투명 PNG 직접 제작
- URL: https://itool.co.kr/blog/corporate-stamp-guide/
- 비대면 전자계약에 쓰는 법인 직인(법인도장)과 사업자 명판 이미지를 무료로 직접 만드는 법. 회사명만 입력하면 투명 PNG로 즉시 생성, 명판에 직인 합성까지. 설치·로그인 불필요.
- Tags: 법인도장만들기, 법인직인만들기, 직인만들기, 사업자명판만들기, 명판제작, 대표이사직인, 전자도장

### 도장 누끼 포토샵 없이! 실물 도장 사진을 무료 투명 PNG로 만들기
- URL: https://itool.co.kr/blog/stamp-extract-guide/
- 포토샵 없이 브라우저에서 무료로 도장 누끼 따는 법. 흰 종이에 찍은 실물 도장을 사진으로 올리면 배경을 투명하게 빼고 도장만 PNG로 저장합니다. 인감·법인도장 스캔, 자동 크롭, 로그인 불필요.
- Tags: 도장누끼, 도장스캔, 도장png, 도장투명배경, 전자도장, 도장이미지추출, 인감도장스캔

### 아이폰 사진에 날짜가 안 나와요? 필름카메라처럼 사진에 날짜 넣는 법
- URL: https://itool.co.kr/blog/photo-date-stamp-guide/
- 아이폰·갤럭시 사진에 촬영 날짜가 안 나오나요? 이미 찍은 사진에 옛날 필름카메라처럼 날짜와 시간을 넣는 법을 알려드려요. 설치 없이 브라우저에서 촬영일자를 자동으로 읽어 1분이면 끝납니다.
- Tags: 사진에 날짜 표시, 사진 날짜 넣기, 아이폰 사진 날짜, 필름카메라 날짜, 사진 날짜 어플, 갤럭시 사진 날짜, 타임스탬프 사진, 감성 사진 날짜

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- URL: https://itool.co.kr/blog/freelance-tax-3-3-guide/
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- Tags: 3.3%계산기, 3.3계산기, 3.3환급, 프리랜서세금, 원천징수, 소득세계산법, 실수령액계산기, 종합소득세환급

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- URL: https://itool.co.kr/blog/rent-conversion-rate/
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- Tags: 전월세전환율, 전세월세전환계산, 전월세전환율계산기, 전세월세전환, 전월세전환율기준, 전월세전환율상한, 반전세계산기, 월세전세전환

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- URL: https://itool.co.kr/blog/unemployment-benefit-guide/
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- Tags: 실업급여계산기, 실업급여조건, 구직급여계산, 실업급여얼마, 2026실업급여, 권고사직실업급여, 실업급여신청

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- URL: https://itool.co.kr/blog/how-to-open-md-file/
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- Tags: MD파일, 마크다운, md파일여는법, README, 마크다운뷰어, 개발자팁

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- URL: https://itool.co.kr/blog/google-play-books-epub-to-ebook-reader/
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- Tags: 구글플레이북스, EPUB변환, 전자책변환, Kindle, BOOX, Calibre, AdobeDigitalEditions, DRM, 전자책

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- URL: https://itool.co.kr/blog/civil-servant-salary-2026/
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- Tags: 공무원봉급표, 2026공무원봉급표, 일반직공무원봉급표, 9급공무원봉급, 공무원봉급인상률, 공무원호봉, 공무원연봉

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- URL: https://itool.co.kr/blog/savings-interest-guide/
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- Tags: 적금계산기, 예금계산기, 예금이자계산, 적금예금차이, 월복리적금, 비과세적금, 세금우대적금, 이자계산기

### 2026 최저시급·주휴수당 계산법 완전 정복 - 월급까지 한 번에
- URL: https://itool.co.kr/blog/hourly-wage-guide/
- 2026년 최저시급 10,320원 기준 주휴수당 계산법, 월급 환산 공식, 주휴수당 안 주는 경우 대처법까지 알바·파트타임 필수 정보를 정리했습니다.
- Tags: 주휴수당계산기, 시급계산기, 최저시급월급, 2026최저임금, 주휴수당계산, 알바주휴수당, 최저시급계산기

### YAML 함정 5가지 - NO가 false가 되는 Norway Problem부터 탭 들여쓰기까지
- URL: https://itool.co.kr/blog/yaml-gotchas/
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- Tags: YAML, YAML함정, YAML주석, Kubernetes, DevOps, 설정파일, 개발자

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- URL: https://itool.co.kr/blog/loan-repayment-guide/
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- Tags: 원리금균등상환계산기, 원금균등상환계산기, 중도상환수수료계산기, 대출이자계산기, 주택담보대출, 대출상환방법, 이자절약

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- URL: https://itool.co.kr/blog/percentage-calculator-guide/
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- Tags: 퍼센트계산기, 백분율계산기, 주식수익률계산기, 퍼센트계산, 백분율계산, 할인율계산기, 증감률계산

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- URL: https://itool.co.kr/blog/webp-to-jpg-conversion-guide/
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- Tags: 이미지변환, WebP, JPG, 파일변환

### 의심스러운 QR코드, 찍기 전에 확인하는 법 - PC에서 이미지로 읽기
- URL: https://itool.co.kr/blog/qr-scanner-guide/
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- Tags: QR코드, QR코드 읽기, QR코드 인식, 피싱, 스미싱, QR피싱, 보안, QR리더

### JSON 포맷터 사용법 - 깨진 JSON 복구, 들여쓰기, 유효성 검사까지
- URL: https://itool.co.kr/blog/json-parser-guide/
- 서버에서 받은 한 줄짜리 JSON을 1초 만에 정리하고, 따옴표 하나 빠진 깨진 JSON도 Lenient 모드로 복구하세요. 온라인 무료 JSON 파서 사용법과 자주 만나는 에러 5가지를 정리했습니다.
- Tags: JSON, JSON포맷터, JSON파서, JSON들여쓰기, JSON유효성검사, JSON에러, 개발자도구

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- URL: https://itool.co.kr/blog/petition-letter-guide/
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- Tags: 탄원서, 탄원서양식, 탄원서작성방법, 탄원서예시, 선처탄원서양식, 엄벌탄원서, 음주운전탄원서, 탄원서쓰는법, 법원탄원서양식

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- URL: https://itool.co.kr/blog/age-calculator-guide/
- 만나이 통일법 시행 이후 2026년 만 나이 계산법을 쉽게 정리했습니다. 연나이 만나이 차이, 띠별 계산표, 예외 4가지(학교·병역·청소년·주류담배)까지 한 번에 확인하세요.
- Tags: 만나이계산법, 만나이, 만나이계산, 2026년만나이, 연나이, 세는나이, 만나이통일법, 만나이계산기, 나이계산

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- URL: https://itool.co.kr/blog/quotation-guide/
- 견적서 작성 3단계부터 자동계산 엑셀 양식까지. 공급가액, 부가세, 합계가 자동으로 계산되는 무료 견적서 양식을 XLS, PDF, 구글 시트로 바로 다운로드하세요.
- Tags: 견적서, 견적서양식, 견적서쓰는법, 견적서작성법, 견적서양식엑셀, 무료견적서양식, 견적서다운로드, 부가세계산

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- URL: https://itool.co.kr/blog/family-loan-agreement-guide/
- 부모님께 전세 자금을 빌리면서 차용증을 안 썼다면 증여세 폭탄을 맞을 수 있습니다. 가족간 무이자 차용증 양식과 작성예시, 증여세 없이 빌릴 수 있는 한도까지 정리했습니다.
- Tags: 가족간차용증, 가족간차용증양식, 차용증쓰는법, 증여세, 부모자식차용증, 무이자차용증, 차용증작성예시

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- URL: https://itool.co.kr/blog/partnership-agreement-guide/
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- Tags: 동업계약서, 동업계약서양식, 동업해지계약서, 공동사업, 창업계약서, 동업자계약, 동업정산

### 중고차 직거래 양식, 뭘 써야 하나? - 자동차 매매계약서 양식 무료 다운로드
- URL: https://itool.co.kr/blog/car-transfer-guide/
- 중고차를 직거래로 사고팔 때 필요한 자동차 매매계약서(양도증명서) 양식을 무료로 다운로드하세요. 개인 직거래용, 매매업자 거래용 양식 차이와 작성법을 정리했습니다.
- Tags: 자동차매매계약서, 자동차양도증명서, 중고차직거래, 차량매매계약서, 중고차계약서, 자동차양도양수, 차량이전등록

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- URL: https://itool.co.kr/blog/divorce-procedure-guide/
- 협의이혼 절차를 단계별로 정리했습니다. 필요한 이혼서류 양식 3종을 무료로 다운로드하고, 숙려기간·양육교육·양육 협의서까지 한 번에 확인하세요.
- Tags: 협의이혼절차, 협의이혼서류, 이혼서류양식, 협의이혼의사확인신청서, 이혼신청서, 협의이혼준비, 양육협의서

### 아이폰·갤럭시에서 EGG 파일 여는 법 - 앱 설치 없이 폰으로 바로
- URL: https://itool.co.kr/blog/egg-file-open-mobile/
- 카카오톡이나 메일로 받은 EGG 파일, 아이폰·갤럭시에서도 앱 설치 없이 브라우저로 바로 풉니다. 파일 저장 위치까지 상세 안내.
- Tags: 아이폰EGG, 갤럭시EGG, 모바일EGG, EGG파일열기아이폰, EGG파일열기핸드폰, EGG파일열기모바일, 폰알집, 아이패드EGG

### 맥북에서 EGG 파일 여는 법 - 알집 없이 Safari로 3초 해결
- URL: https://itool.co.kr/blog/egg-file-open-macbook/
- 맥북·맥북프로·맥북에어에서 EGG 파일이 안 열리시나요? 알집 설치 없이 브라우저에서 바로 EGG 압축을 푸는 방법입니다. M1·M2·M3 모두 지원.
- Tags: 맥북EGG여는법, 맥북EGG파일, 맥알집대체, 맥압축풀기, 맥북압축풀기, 맥EGG파일열기, EGG파일맥북, 맥알집없이

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- URL: https://itool.co.kr/blog/non-prosecution-statement-guide/
- 처벌불원서 양식 무료 다운로드. 합의서와 뭐가 다른지, 반의사불벌죄는 뭔지, 제출 시 주의할 점까지 한번에 정리했습니다.
- Tags: 처벌불원서양식, 처벌불원서, 반의사불벌죄, 합의서, 고소취하, 형사합의, 폭행합의

### 합의서 양식 무료 다운로드 - 형사합의서 작성법과 주의사항
- URL: https://itool.co.kr/blog/criminal-settlement-agreement-guide/
- 합의서 양식 무료 다운로드. 폭행, 교통사고, 절도 등 형사사건 합의서 작성법과 합의금, 처벌불원서까지 한번에 정리했습니다.
- Tags: 합의서양식, 형사합의서, 합의서작성, 폭행합의서, 교통사고합의서, 합의서양식무료, 처벌불원서

### 이력서 양식 무료 다운로드 - HWP, 워드, PDF 바로 받기
- URL: https://itool.co.kr/blog/resume-form-free-download/
- 이력서 양식 무료 다운로드. 로그인 없이 HWP, DOC, PDF 3종을 바로 받으세요. 신입·알바·경력직 모두 사용 가능한 깔끔한 기본 양식입니다.
- Tags: 이력서양식, 이력서양식무료다운로드, 이력서다운로드, 이력서hwp, 이력서쓰는법, 알바이력서, 신입이력서, 취업

### 습관 트래커 무료 PDF - 출력해서 벽에 붙이면 달성률 42% 올라가는 이유
- URL: https://itool.co.kr/blog/habit-tracker-printable/
- 무료 습관 트래커 PDF 다운로드. 종이에 적으면 목표 달성률이 42% 높아진다는 연구 결과와 함께, 갓생 루틴 만드는 실전 방법을 알려드립니다.
- Tags: 습관 트래커, 습관 만들기, 갓생, 미라클 모닝, 루틴 만들기, 자기계발, 66일 습관

### PDF 텍스트 추출 무료 - 글자 복사가 안 되는 PDF에서 텍스트 꺼내는 법
- URL: https://itool.co.kr/blog/pdf-extract-text-guide/
- PDF에서 텍스트를 추출하는 무료 방법. 설치 없이 브라우저에서 페이지별 글자를 복사·다운로드할 수 있습니다.
- Tags: PDF 텍스트 추출, PDF 글자 추출, PDF 글자 복사, PDF OCR, PDF 추출, 텍스트 추출

### 문서 양식 다운로드, 왜 이렇게 짜증나? - iTool은 다릅니다
- URL: https://itool.co.kr/blog/why-itool-forms/
- 로그인, 비밀번호, 유료 결제... 문서 양식 하나 받으려고 고생하셨죠? iTool은 HWP·DOC·PDF 3종을 로그인 없이 무료 제공합니다.
- Tags: 문서양식, 무료양식, 양식다운로드, HWP양식, 서식무료, 무료서식사이트

### 전세·월세 계약 전 꼭 확인해야 할 7가지 - 전세사기 예방 체크리스트
- URL: https://itool.co.kr/blog/housing-lease-contract-guide/
- 전세계약, 월세계약 전에 반드시 확인해야 할 체크리스트 7가지를 정리했습니다. 등기부등본 확인부터 전세보증보험까지, 전세사기를 예방하는 핵심 포인트입니다.
- Tags: 전세계약주의사항, 월세계약주의사항, 전세사기예방, 전세보증보험, 주택임대차보호법, 임대차계약서, 전입신고확정일자

### 부가세 계산기 활용법 - 합계금액에서 공급가액 구하는 공식과 흔한 실수
- URL: https://itool.co.kr/blog/vat-calculation-guide/
- 무료 부가세 계산기로 공급가액과 부가세를 정확하게 분리하는 방법. 많은 분이 틀리는 ×0.1 실수와 올바른 계산법을 알려드립니다.
- Tags: 부가세계산기, 부가세계산법, 부가가치세, 공급가액, 부가세, 세금계산서, 부가세계산기무료

### 사진 용량 줄이기 - 메일 첨부, 쇼핑몰 등록, SNS 업로드용 압축 가이드
- URL: https://itool.co.kr/blog/photo-resize-for-upload/
- 메일 첨부 용량 초과, 쇼핑몰 5MB 제한, SNS 업로드 실패 해결! 상황별 최적 품질 설정과 무료 이미지 압축 방법 총정리
- Tags: 사진압축, 이미지용량줄이기, 메일첨부, 쇼핑몰사진, 이미지압축

### 아이폰 사진이 안 열릴 때 - HEIC 파일 3초 만에 JPG로 바꾸는 법
- URL: https://itool.co.kr/blog/iphone-heic-photo-guide/
- 아이폰 HEIC 사진이 카톡이나 PC에서 안 열릴 때 해결법. 설치 없이 3초 만에 JPG로 변환하는 방법과 아이폰 설정 변경법까지 총정리
- Tags: 아이폰사진, HEIC, JPG변환, 사진변환, 아이폰

### 문서 양식 무료 다운로드 - 근로계약서, 차용증, 재직증명서 등 HWP·DOC·PDF 제공
- URL: https://itool.co.kr/blog/free-document-forms-download/
- 자주 쓰는 문서 양식을 HWP, DOC, PDF 3가지 형식으로 무료 다운로드할 수 있습니다. 로그인 없이 바로 받으세요.
- Tags: 문서양식, 서식다운로드, 무료양식, HWP, 근로계약서, 차용증, 재직증명서

### PDF 자르기 (크롭) - 여백 제거, 원하는 영역만 깔끔하게 추출
- URL: https://itool.co.kr/blog/pdf-crop-guide/
- PDF 문서의 불필요한 여백을 제거하고 원하는 영역만 남기는 방법. 스캔 문서 정리, 슬라이드 편집에 유용합니다. 무료 온라인 PDF 크롭 도구.
- Tags: PDF자르기, PDF크롭, PDF여백제거, PDF편집, PDF여백자르기

### PDF JPG 변환 무료 - 고화질 이미지로 바꾸는 법 (PDF to JPG)
- URL: https://itool.co.kr/blog/pdf-to-jpg-guide/
- PDF를 JPG로 변환하는 무료 방법. 고화질 이미지로 변환되며, 설치 없이 브라우저에서 바로 사용 가능합니다.
- Tags: PDF JPG 변환, PDF변환, PDF to JPG, 이미지변환, 무료변환기, PDF이미지변환

### 블로그 이미지 WebP 변환: 로딩 속도 올리고 이탈률 낮추는 방법
- URL: https://itool.co.kr/blog/webp-conversion-for-web/
- 블로그와 워드프레스 이미지를 WebP로 변환해서 페이지 속도를 높이고 방문자 이탈률을 줄이는 방법을 알아봅니다.
- Tags: WebP변환, 블로그최적화, 워드프레스, 이탈률, 페이지속도

### 무료 도장 이미지 만들기 - 온라인에서 전자도장, 직인 바로 만드는 법
- URL: https://itool.co.kr/blog/stamp-maker-guide/
- 무료 온라인 도장 만들기. 설치 없이 도장 이미지, 전자도장, 직인을 브라우저에서 바로 만들어 PNG로 다운로드하세요. 한자 도장도 지원합니다.
- Tags: 도장만들기, 도장이미지만들기, 온라인도장만들기, 무료도장만들기, 전자도장만들기, 직인만들기, 무료도장이미지, 도장파일만들기

### SVG를 PNG로 변환하는 방법 - SVG 여백 제거까지 한 번에
- URL: https://itool.co.kr/blog/svg-to-png-conversion-guide/
- SVG 파일을 PNG로 무료 변환하는 방법과 SVG 여백을 자동으로 제거하는 방법을 알려드립니다. 브라우저에서 안전하게 처리됩니다.
- Tags: SVG, PNG, 이미지변환, SVG여백제거, 벡터이미지

### HEIC 파일 열기 - 변환 없이 바로 보는 방법
- URL: https://itool.co.kr/blog/heic-viewer-guide/
- 아이폰 HEIC 사진이 컴퓨터에서 안 열릴 때! 변환 없이 브라우저에서 바로 보는 무료 HEIC 뷰어
- Tags: HEIC뷰어, HEIC열기, 아이폰사진, 무료도구

### 텍스트 비교 도구 활용법: 두 문서의 차이를 한눈에 찾기
- URL: https://itool.co.kr/blog/text-diff-guide/
- 텍스트 비교 도구로 문서 차이점을 쉽게 찾아보세요. 계약서 수정사항, 코드 변경점, 번역 대조까지 실시간 비교 완벽 가이드
- Tags: 텍스트비교, 문서비교, diff, 생산성

### PDF 페이지 삭제 방법 - 필요 없는 페이지만 쏙 빼기
- URL: https://itool.co.kr/blog/pdf-delete-pages-guide/
- PDF에서 원하는 페이지만 삭제하는 방법을 알아봅니다. 체크박스로 간편하게 선택하고 삭제할 수 있는 실전 가이드입니다.
- Tags: PDF페이지삭제, PDF편집, 문서정리, PDF도구

### 이미지 압축 완벽 가이드: 품질 유지하며 파일 크기 줄이기
- URL: https://itool.co.kr/blog/image-compression-howto/
- 웹사이트 속도 향상과 저장 공간 절약을 위한 이미지 압축 방법을 알아봅니다. 최상의 품질로 파일 크기를 줄이는 실전 가이드입니다.
- Tags: 이미지압축, 이미지최적화, 파일크기

### 글자수 세기 완벽 가이드: 무료 온라인 도구로 텍스트 분석하기
- URL: https://itool.co.kr/blog/character-counter-guide/
- 글자수 세기 도구 사용법과 활용 방법을 알아보세요. 공백 포함/제외, 바이트 계산, 단어 수 세기 등 실시간 텍스트 분석 완벽 가이드
- Tags: 글자수, 텍스트, 도구, 생산성

### HEIC를 JPG로 변환하는 방법 - 아이폰 사진 호환성 높이기
- URL: https://itool.co.kr/blog/heic-to-jpg-conversion-guide/
- iPhone HEIC 사진을 JPG로 변환하는 방법을 알아봅니다. 모든 기기에서 볼 수 있게 호환성을 높이는 간단한 가이드입니다.
- Tags: 이미지변환, HEIC, JPG, 아이폰사진

### WebP를 PNG로 변환하는 방법 - 투명 배경 유지하며 호환성 높이기
- URL: https://itool.co.kr/blog/webp-to-png-conversion-guide/
- WebP 이미지를 PNG로 변환하여 투명 배경을 유지하면서 브라우저와 프로그램 호환성을 높이는 방법을 알아봅니다.
- Tags: 이미지변환, WebP, PNG, 투명배경

### JPG를 PNG로 변환하는 방법 - 품질 손실 없이 쉽게 바꾸기
- URL: https://itool.co.kr/blog/jpg-to-png-conversion-guide/
- JPG 이미지를 PNG로 변환하는 방법을 알아봅니다. 투명 배경이 필요하거나 무손실 포맷이 필요할 때 유용한 변환 가이드입니다.
- Tags: 이미지변환, JPG, PNG, 파일변환

### PDF 편집 완벽 가이드 - 서명, 체크, 그리기로 PDF를 자유롭게 편집하는 방법
- URL: https://itool.co.kr/blog/pdf-edit-guide/
- PDF에 서명, 체크 표시, 그리기, 텍스트를 추가하는 방법을 알아봅니다. 브라우저에서 안전하고 빠르게 PDF를 편집할 수 있는 실전 가이드입니다.
- Tags: PDF편집, PDF서명, PDF주석, 문서편집

### PDF 나누기 완벽 가이드 - 가위 아이콘으로 간편하게 PDF 분할하는 방법
- URL: https://itool.co.kr/blog/pdf-split-guide/
- PDF 파일을 여러 개로 나누는 방법을 알아봅니다. 브라우저에서 안전하고 빠르게 PDF를 분할할 수 있는 실전 가이드입니다.
- Tags: PDF나누기, PDF분할, PDF쪼개기, 문서정리, PDF도구

### PNG를 JPG로 변환하는 방법 - 파일 크기 줄이고 용량 절약하기
- URL: https://itool.co.kr/blog/png-to-jpg-conversion-guide/
- PNG 이미지를 JPG로 변환하여 파일 크기를 줄이는 방법을 알아봅니다. 웹사이트 속도 향상과 저장 공간 절약에 유용한 가이드입니다.
- Tags: 이미지변환, PNG, JPG, 파일압축

### AVIF 파일 변환 방법 - AVIF를 JPG, PNG로 무료 변환하기
- URL: https://itool.co.kr/blog/avif-conversion-guide/
- 차세대 이미지 포맷 AVIF를 JPG, PNG로 변환하는 방법을 알아봅니다. 브라우저에서 안전하고 빠르게 변환할 수 있는 실전 가이드입니다.
- Tags: 이미지변환, AVIF, JPG, PNG, 파일변환

### 이미지 변환 가이드 - JPG, PNG, WebP 언제 뭘 써야 할까?
- URL: https://itool.co.kr/blog/image-conversion-complete-guide/
- JPG, PNG, WebP 이미지 포맷의 차이점과 변환 방법을 쉽게 설명합니다. 상황별 최적의 포맷 선택 가이드입니다.
- Tags: 이미지변환, JPG, PNG, WebP, 이미지포맷

### 파일 형식 변환 완벽 가이드 - 언제 어떤 포맷을 사용해야 할까?
- URL: https://itool.co.kr/blog/file-format-conversion/
- JPG, PNG, WebP, PDF 등 파일 형식의 특징과 용도를 이해하고, 상황에 맞는 최적의 포맷으로 변환하는 방법을 알아봅니다.
- Tags: 파일변환, 이미지변환, JPG변환, PNG변환

### PDF 합치기 완벽 가이드 - 여러 PDF와 이미지를 하나로 합치는 방법
- URL: https://itool.co.kr/blog/pdf-merge-guide/
- PDF 파일과 이미지를 하나로 합치는 방법을 알아봅니다. 브라우저에서 안전하고 빠르게 PDF를 합칠 수 있는 실전 가이드입니다.
- Tags: PDF합치기, PDF병합, 문서정리, PDF도구

### 이미지 압축 팁 - 품질 유지하면서 용량 80% 줄이는 방법
- URL: https://itool.co.kr/blog/image-compression-tips/
- 카카오톡, 이메일 첨부 용량 제한 해결! 이미지 품질은 유지하면서 파일 크기를 80%까지 줄이는 실전 팁
- Tags: 이미지압축, 용량줄이기, 카카오톡, 이메일첨부

### BMP를 JPG로 변환하는 방법 - 용량 95% 줄이기
- URL: https://itool.co.kr/blog/bmp-conversion-guide/
- BMP 파일을 JPG나 PNG로 변환하여 용량을 대폭 줄이는 방법. 웹 업로드와 이메일 첨부에 최적화된 무료 변환 가이드입니다.
- Tags: 이미지변환, BMP, JPG, PNG, 파일변환

### TIFF를 JPG로 변환하는 방법 - 대용량 파일 90% 줄이기
- URL: https://itool.co.kr/blog/tiff-conversion-guide/
- TIFF 파일을 JPG나 PNG로 변환하여 용량을 대폭 줄이는 방법. 스캔 문서와 전문 사진을 웹용으로 최적화하는 무료 가이드입니다.
- Tags: 이미지변환, TIFF, JPG, PNG, 파일변환, TIF

### 텍스트 편집 완전 정복 - 공백 제거, 줄바꿈 정리 한 번에
- URL: https://itool.co.kr/blog/text-editing-tips/
- 공백 제거, 줄바꿈 처리, 대소문자 변환 등 텍스트 편집을 무료로 간편하게. 복사한 텍스트 정리하는 가장 쉬운 방법
- Tags: 텍스트편집, 공백제거, 글자수세기, 생산성

### 이미지를 PDF로 변환하는 방법 - 여러 사진 하나로 합치기
- URL: https://itool.co.kr/blog/image-to-pdf-conversion/
- 여러 이미지 파일을 하나의 PDF 문서로 변환하는 방법을 알아봅니다. 포트폴리오, 문서 제출, 인쇄에 유용한 실전 가이드입니다.
- Tags: 이미지변환, PDF, 파일합치기

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## Technical Details

- Built with Astro (static site generator) + React
- Deployed on Cloudflare Workers
- Client-side processing using JavaScript/TypeScript
- PDF processing: pdf-lib, PDF.js
- Image processing: Browser Canvas API
- No backend servers for file processing