Online image diff tool with pixel-level difference detection. Upload two images, automatically highlight differences with overlay and side-by-side modes. All client-side, no upload needed.
PNG, JPG/JPEG, WebP, GIF, BMP and other common formats. If your images are in different formats, the tool will normalize them via Canvas for pixel-level comparison. For best results, use images with the same format and dimensions.
This tool uses pixel-level comparison, comparing RGB values of each corresponding pixel. When the color difference exceeds a threshold (default 10/255), the pixel is marked as changed. Differences are highlighted in red. You can adjust the sensitivity threshold in settings.
Three export options: β Download the diff overlay as PNG (click 'Export Diff'); β‘ Screenshot side-by-side view via browser; β’ Copy diff statistics (diff pixel count, percentage). All processing is local - no data upload.
No. Everything runs in your browser using HTML5 Canvas API. Your images stay in your device's memory and are cleared when you close the page. Nothing is uploaded.
No strict limit, but for performance, keep images under 4096Γ4096 pixels. Very large images (over 5000Γ5000 pixels) may slow down processing or cause browser memory issues.
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