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File & Image ToolsFree online tool
Perform direct pixel-by-pixel rendering comparison between two user-interface screenshots to catch UI regressions.
Choose your file or image, set any options, then create your result.
Use the controls above, check the result, then copy or download it when available.
Subtle sub-pixel rendering differences, scrollbar widths or system-level font smoothing often create microscopic pixel variations.
Use this tool whenever you need: Frontend regression testing, component refactoring validation and checking web application interface updates against approved mockups. It offers a fast, client-side workflow without sign-ups, installation or complex software.
Yes. All processing executes locally in your browser using client-side JavaScript. Your inputs, files and calculations remain private and are never uploaded to our servers.
Ensure both screenshots are taken on the exact same browser engine, viewport width and device pixel ratio for reliable diff results. Important note: Minor anti-aliasing variations or dynamic operating system font smoothing can register as pixel changes even when code is identical.
Compare two screenshots pixel by pixel and highlight every changed area in red.