Image Pixel Diff
Highlight pixels that differ between two same-size images (heatmap overlay).
How to Use
- Drop two images of equal dimensions.
- Adjust threshold; red = differing pixels.
Notes
About the Image Pixel Diff
The Image Pixel Diff gives you a fast, free answer for image, audio and file tasks without sending anything off your device. Highlight pixels that differ between two same-size images (heatmap overlay).
How it works
Enter what you have and read the result as it updates live. It all runs on your own device, so it is quick and private, with nothing to install.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
Different sizes?
Both are scaled to match the smaller before diffing.
% diff?
Summary shows differing pixel count.
How do I use the Image Pixel Diff?
Simply type your numbers and read the result, which refreshes the instant you change something. There is nothing to submit and nothing to wait for.
Does it cost anything or need an account?
No. The tool is completely free, there is no account to create, and it keeps working offline after the page first loads.
Is anything I type uploaded?
No. The tool works entirely on your device, so the values you enter never leave your browser.
Common Use Cases
Regression testing
Visual diff across versions.
Compression QA
See where artifacts concentrate.
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