Developer builds browser extension for pixel-level image diffs in GitHub PRs

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A developer has released gh-pixel-diff, a browser extension that adds explicit pixel-difference highlighting to GitHub's existing image comparison tools in pull requests. The tool was created to address the need to pinpoint exact visual changes—such as padding shifts or element movement—without manually switching between GitHub and external test reports like Playwright. It works locally in the browser with no server-side image processing, and supports GitHub, GitLab, and self-hosted instances of both platforms. Users can zoom, pan, step through changed regions, switch between multiple diff views, and export the result as a PNG for review comments. The extension is available on the Chrome Web Store and Firefox Add-ons, with Safari requiring manual installation via Xcode, and the source code is MIT-licensed.

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