Ever notice how most "free" image compressors upload your files to their servers?
I got fed up with this — especially when compressing screenshots that might contain sensitive data — so I built QuickShrink: an image compressor that runs entirely in your browser.
Why client-side matters
- Privacy: Your images never leave your device
- Speed: No upload/download round-trip. Compression is instant
- Works offline: It's a PWA. Install it and use it without internet
- No account needed: Just drag, drop, done
What it does
- Compress JPEG/PNG/WebP with adjustable quality (1-100)
- Batch compress multiple images at once
- Convert between formats (PNG to WebP for 60-80% size reduction)
- Resize images with aspect ratio lock
- See before/after comparison with file sizes
The tech
Built with vanilla JavaScript + Canvas API + OffscreenWorker for non-blocking compression. The entire app is about 50KB. No React, no framework, no build step.
Try it
Free tier: 5 compressions/day
Pro: Unlimited + batch + format conversion ($4.99 one-time)
I'd love feedback on compression quality vs file size. Is the default quality slider (80%) a good default for web images?
Built this as a weekend project after TinyPNG's free tier dropped to 20 images/month. If you're compressing screenshots or blog images regularly, give it a shot.
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