Image Diff Tool - Compare Images Pixel-by-Pixel Free

Compare two images side-by-side with pixel difference highlighting. Shows change percentage and slider view. Download diff overlay.

Image A (Before)

Drop image here or click to browse

JPG, PNG, WebP, GIF

Image B (After)

Drop image here or click to browse

JPG, PNG, WebP, GIF

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Frequently Asked Questions

Image diff (difference) comparison analyzes two images pixel-by-pixel to identify changes. It highlights areas where pixels differ in color or position, making it easy to spot modifications, edits, or design variations between versions.

Use this for before/after comparisons, detecting image edits, comparing design mockups vs implementation, identifying photo manipulations, validating image processing results, or quality assurance testing for visual changes.

Three modes: Side-by-Side (view both images simultaneously), Slider (drag to reveal one image over the other), and Difference Overlay (highlights changed pixels in red with adjustable sensitivity).

The tool compares each pixel's RGB values. If any color channel differs beyond the sensitivity threshold, it counts as changed. Percentage = (changed pixels / total pixels) × 100. Higher sensitivity detects smaller changes.

Yes! Use the sensitivity slider to control how strict the comparison is. Low sensitivity (5-10) ignores minor compression artifacts. High sensitivity (50-100) detects even slight color variations.

Images are automatically aligned at the top-left corner. The comparison area uses the smallest common dimensions. Portions extending beyond are shown but not included in the difference calculation.

Yes! The Download Diff Image button saves a PNG showing changed pixels highlighted in red against the original image. Perfect for documenting changes or reporting issues.

No. All comparison happens locally in your browser using Canvas API. Your images never leave your device - completely private and secure. No server processing involved.

Upload JPG, PNG, WebP, GIF, or any browser-supported image format. Both images can be different formats - the comparison works at the pixel level regardless of file type.

After uploading both images, switch to Slider mode. Drag the slider handle left or right to reveal more of Image A or Image B. This interactive view makes it easy to spot differences by swiping back and forth.

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