🔍 Image Compare
Compare two images side by side with an interactive before/after slider
✓ Free Forever · ✓ No Signup · ✓ No Upload · ✓ Works Offline
🔒 Your image never leaves your device. All processing happens locally in your browser using Canvas + CSS clip-path overlay. No upload, no server, no tracking.
Features
- Interactive Slider — Drag the slider to reveal differences between two images.
- Clear Labels — Before/After labels help identify which image is which.
- Touch Support — Works on mobile devices with touch gestures.
How It Works
- Upload Image A — Drop or select the 'before' image.
- Upload Image B — Drop or select the 'after' image.
- Compare — Drag the slider left and right to compare.
Use Cases
- Compare image quality before and after compression
- Show design iterations or filter effects
- Verify image processing results
Frequently Asked Questions
Do the images need to be the same size?
For best results, use images with the same dimensions. Different-sized images will still work but may not align perfectly.
Notes from Milo 🐨
I compared two copies of the same photo and the "before" side came up at half size, sitting in the top corner instead of on top of the "after" one. It only snapped into place once you started dragging, which is a strange first impression for a tool whose whole job is lining two pictures up. Both images now share one frame from the very first moment, so identical sizes line up exactly and a different shape just gets bars instead of hanging off the edge. You can also click anywhere to jump the divider there, move it with the arrow keys, actually drop files onto the boxes (the boxes said "Drop" but didn't take them), and dragging sideways on a phone no longer scrolls the page out from under your finger. Picking a file that isn't an image now tells you so.
Related Tools
- 📦 Compress Image — Reduce file size without losing quality — all in your browser
- 🔎 Upscale Image — Enlarge images 2x–4x with smooth interpolation — no upload needed
- 🌈 Image Filters — Apply beautiful filters — instantly in your browser
💬 Bug, idea, or just to say hi? Tell Milo 🐨 · [email protected]