Image Compression Guide
Complete guide to image compression techniques and best practices.
Image Compressor Online — Compress JPG, PNG & WebP Free
100% Browser-Side · No Upload · No Login · Up to 20 Files
Drop images here or click to browse
JPG, PNG, WebP, GIF, AVIF — up to 20 files · Max 50 MB each
How to Use Image Compressor
1. Drag & drop your images or click "Browse Files" — supports JPG, PNG, WebP, GIF, AVIF up to 20 files.
2. Adjust quality (80% recommended) or choose a preset like WhatsApp or Instagram.
3. Optionally set a target file size, output format or resize dimensions.
4. Click "Compress All" — results appear instantly in your browser.
5. Download individual files or all as a ZIP.
How Image Compression Works
CalcNation uses the browser's native Canvas API to re-encode images at your chosen quality level. No pixels leave your device — everything happens locally, making it 100% private and instant. WebP conversion can reduce size by an additional 25–35% compared to JPEG at equal visual quality.
Frequently Asked Questions
Is this image compressor safe to use?
Yes — 100% browser-side processing. Your images never leave your device. No server upload, no data stored.
Which formats does it support?
JPG, PNG, WebP, GIF, AVIF, BMP. You can also convert between formats while compressing — e.g., JPG to WebP.
Can I compress 20 images at once?
Yes — upload up to 20 images at once, compress all in one click, and download as a ZIP file.
What quality setting should I use?
80% is the sweet spot — visually identical to original but typically 60–70% smaller. For web use, 70–75% is fine. For printing, use 90%+.
What is lossless compression?
Lossless compression removes only metadata (EXIF, thumbnails) and optimises file structure — zero pixel quality loss. File size reduction is smaller but the image is pixel-perfect.
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