Private browser-based image diff

Image Compare & Difference Checker

Compare two images side by side, overlay them, or highlight pixel-level differences for screenshot review, design QA, and visual regression checks.

No image uploadWorker-based local analysisJPG · PNG · WebP · AVIF · GIF · BMP

A

Original / Version A

B

Revised / Version B

How it works

Find image differences in three steps

Add two image versions, choose a comparison mode, and tune sensitivity to quickly locate changed areas.

  1. 01

    Add two versions

    Choose the original and revised image by dropping files or browsing your device.

  2. 02

    Choose a compare mode

    Use side-by-side, overlay, or difference heatmap to inspect changes.

  3. 03

    Locate and export

    Tune sensitivity, review the changed area, and download a diff image.

Supported formats and modes

Accepts JPG, JPEG, PNG, WebP, AVIF, GIF, and BMP. Different dimensions are drawn onto Version A’s comparison canvas; originals are never uploaded.

JPGPNGWebPAVIFGIFBMP

Common use cases

  • Website and app screenshot regression
  • Design, poster, and export QA
  • Checking image quality after compression or conversion
  • Reviewing scanned document versions

FAQ

Frequently asked questions

How should I set difference sensitivity?

The default value of 8 works well for most screenshots. Lower values catch subtle color changes; higher values help ignore compression noise.

Can I compare images with different dimensions?

Yes. Version B is drawn into Version A’s dimensions and the page tells you when alignment was applied. For strict pixel regression, use matching dimensions first.

Are my images uploaded or saved?

No. Files are read through browser object URLs, and analysis plus diff generation happen on this device. Temporary URLs are released when you leave the page.

Why does this page not use FFmpeg or MediaBunny?

This is a pixel comparison task, not video container or audio/video encoding. Canvas plus a Worker is lighter and better suited to comparing images in the browser.

Can I download the difference image?

Yes. After analysis, choose Download diff image to export a PNG heatmap. Your two source images remain unchanged.

Your images stay on your device

Image decoding, alignment, pixel analysis, and diff rendering all happen in your browser. The pixel loop runs in a Worker so large images do not block the interface.

Related tools and guides

Continue your image workflow

Compare first, then compress, inspect metadata, or make a screenshot safer to share.

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