Compress Image
Free online image compressor — reduce file size by up to 80% while keeping visual quality. No upload to server.
How to Use
- Select Files: Upload image files
- Choose Quality: Select low/medium/high
- Start Compress: Click compress button
- Download: Get compressed files
Quality
Drop image files here
Supported: .jpg, .jpeg, .png, .webp, .heic, .heif, .gif, .bmp, .tiff, .tif, .avif
Compressing...
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Compression Results (Total: 0 files)
Some files cannot be converted.
Compressible files:
.jpg .jpeg .png .webp .heic .heif .gif .bmp .tiff .avif
More iTool Features!
HEIC Viewer
Free online HEIC viewer — open and convert Apple HEIC/HEIF photos on any device. No install, no signup required.
Image to JPG
Free online image to JPG converter — convert PNG, WebP, BMP, HEIC to JPG. Batch convert up to 20 files at once.
Image to PNG
Free online image to PNG converter — convert JPG, WebP, BMP, and more to PNG. No install, no upload to server.
Image to WebP
Free online image to WebP converter — shrink image file size with modern WebP format. No install, no upload to server.
SVG Crop
Free online SVG cropper — auto-trim extra whitespace and margins from SVG files. No install, no upload to server.
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Why iTool is Great
- Fast: Processed right on your device
- Free: Unlimited use, no sign-up required
- Secure: Your photos never leave your device
- Batch Processing: Convert up to 20 images at once
- ZIP Download: Get all images in one ZIP file
- Quality Preserved: Your images stay sharp
- Memory Managed: Automatic memory management keeps your computer running smooth
File Size Limits
- Image Count: Max 20 images at once
- Per Image: Max 50MB (prevents slowdown)
- Total Size: 200MB total recommended
When to Use
- Email Attachments: Reduce file size for email
- Blog Posts: Make images load faster
- Phone Storage Full: Save space while keeping quality
- Website Upload: Speed up your website with smaller images
How to choose quality?
Choose based on your needs:
- Low (60%): Messaging apps - smallest size
- Medium (80%): Blog, SNS - balanced
- High (90%): Print - quality first, light compression
FAQ
How much smaller will it be?
Varies by image. Typically: Low (60%) → 50-70%, Medium (80%) → 70-85%, High (90%) → 90-95% of original size.
Will compression ruin quality?
No! Medium (80%) or High (90%) show minimal difference. Low (60%) may be slightly blurry.
What happens to the original?
Your original stays intact! Compressed images download as new files.
Are my photos uploaded anywhere?
No! All processing happens in your browser. Your photos never leave your device.
What if my computer slows down?
Try this:
- Reduce image count (5-10 at a time)
- Close other tabs or windows
- Refresh the page (F5)