Skip to content
ToolSuite
Image Tools

Image Difference Viewer

Compare two images of the same size and highlight every pixel that changed.

or drag them here

image/* · up to 40 MB · up to 2 files

10

Higher ignores small differences such as compression noise.

Processed in your browser

Fill in the form and press “Compare images” to see the result here.

How to use it

  1. 1Select your image, or drag and drop it onto the upload area.
  2. 2Adjust the options if you need something other than the defaults.
  3. 3Press the button. The image is processed on your device - nothing is uploaded.
  4. 4Download the result, or drop in another file to do it again.

About the Image Difference Viewer

Pixels that differ by more than the threshold are marked in red over a faded version of the first image, so the changes are obvious in context.

The threshold matters: two JPEGs saved from the same source at different quality settings differ in almost every pixel by a small amount. Raising the threshold filters out that compression noise and leaves real changes.

Both images must have the same dimensions, since the comparison is pixel by pixel.

Questions people ask

Is your image uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your image never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.

Is it free, and do I need an account?

Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.