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Image Diff — Compare Two Images Pixel by Pixel
Compare two images and see exactly what changed — every differing pixel highlighted, with a precise percentage difference. Spot edits, regressions, and watermarks instantly. No upload, no sign-up; your images never leave your device.
Upload both images to compare them pixel by pixel.
Compare two images pixel by pixel and see exactly what changed: every differing pixel is highlighted and you get a precise percentage difference. It is built for spotting edits, visual regressions, compression artifacts, and watermarks. The comparison runs in your browser, so neither image is uploaded.
How It Works
Choose a tool
Pick from 120+ tools to resize, convert, compress, or enhance your image.
Upload & edit
Drag and drop your image and adjust the settings. It stays on your device.
Download
Save your result instantly — no watermark, no sign-up required.
Why Image Machine?
Your files never leave your device
All processing runs locally in your browser. Your images are never uploaded to a server.
Completely free
Every tool is free, with no limits, no watermarks, and no hidden costs.
Lightning fast
No upload waiting — your images are processed instantly on your own device.
Professional quality
Pixel-perfect output with full control over format, size, and quality.
Frequently Asked Questions
How do I compare two images for differences?
Load both images and the tool overlays them, highlighting every pixel that differs and reporting the exact percentage that changed. Identical images show 0% difference; any edit lights up immediately.
Can I use this for visual regression testing?
Yes. Image Diff is ideal for catching unintended UI or rendering changes between a baseline screenshot and a new one — the highlighted pixels show precisely what moved or recolored.
Do the two images need to be the same size?
Yes. A true pixel-by-pixel comparison requires matching dimensions so each pixel lines up with its counterpart. Resize or crop the images to the same size first if they differ.
Are the images uploaded to compare them?
No. Both images are compared on the canvas in your browser, so nothing leaves your device.