📦 Compress Image
Reduce file size without losing quality — all in your browser
✓ Free Forever · ✓ No Signup · ✓ No Upload · ✓ Works Offline
🔒 Your image never leaves your device. All processing happens locally in your browser using browser-image-compression (Web Worker). No upload, no server, no tracking.
Features
- Smart Compression — AI-assisted compression reduces file size significantly while preserving visual quality.
- Size Comparison — See original vs. compressed file size and the exact percentage saved.
- Visual Comparison — Side-by-side preview so you can verify quality is maintained.
- Web Worker — Compression runs in a background thread — the UI stays responsive.
How It Works
- Upload your image — Drop any JPG, PNG, or WebP image to compress.
- Review results — See the size reduction and compare original vs. compressed quality side by side.
- Download compressed image — Save the smaller file — perfect for websites, emails, and faster loading.
Use Cases
- Optimize images for faster website loading (Core Web Vitals)
- Reduce file size for email attachments
- Shrink photos before uploading to social media
- Save storage space on your device
- Speed up image-heavy web pages
Frequently Asked Questions
How much can I reduce the file size?
Typically 50-80% reduction for JPEGs and 30-60% for PNGs, depending on the image content and original compression level.
Is there visible quality loss?
The algorithm optimizes for perceptual quality. In most cases, the difference is imperceptible to the human eye even at significant size reductions.
What's the maximum file size?
There's no hard limit since processing happens locally. However, very large files (50MB+) may take a few seconds longer.
Notes from Milo 🐨
You can now drop a whole pile of photos at once, not one at a time — pick the quality, and you get a ZIP with all of them compressed. (iPhone HEIC photos work too; they convert automatically.)
Turns out there was no way to actually choose how much to compress — it just picked one level and that was it. Added a quality slider so you can dial the size-vs-clarity trade-off and watch the file size update live.
From the blog
- 📖 Are Free Online File Tools Safe? What Actually Happens to Your Uploads — Most "free online" converters and compressors upload your file to a server. Here's what that means for your privacy, how to tell which tools do it, and how a browser-only tool avoids it entirely.
- 📖 How to Compress an Image Without Wrecking the Quality — Shrink a JPG, PNG, or WebP for web or email without obvious quality loss. How compression actually works, when to use WebP, and a private browser-based way to do it.
Related Tools
- 🔁 Convert Format — Convert between PNG, JPG, WebP — instantly in your browser
- ↔️ Resize Image — Change image dimensions — instantly in your browser
- 🕵️ EXIF Remover — EXIF / Metadata Remover
💬 Bug, idea, or just to say hi? Tell Milo 🐨 · [email protected]