Tools › Image tools › Screenshot Comparison
Compare two images and highlight what's different, in red. Handy for checking design changes or a visual before/after.
Your images are never sent to a server (compared in your browser)
How to use
- Choose the two images you want to compare (before / after).
- Adjust "Sensitivity" if needed (the default usually works well).
- Press "Compare" — differing areas are highlighted in red.
A purely pixel-level comparison
This tool uses a well-established open-source image comparison library (pixelmatch) to compare the color of each pixel at the same position in both images. It has no understanding of what the images mean — so a slight shift in layout or a minor font-rendering difference will show up too.
If the two images are different sizes, image B is automatically scaled to match image A before comparing. If the aspect ratios differ a lot, the comparison becomes less meaningful — this tool works best on screenshots taken at the same resolution.
Handy for
- Checking exactly what changed in a website redesign
- Making sure a code change didn't unintentionally affect the UI (a lightweight visual regression check)
- Spotting what was edited between two versions of a document or slide
FAQ
Are my images uploaded to a server?
No. The comparison happens entirely in your browser.
What does "Sensitivity" adjust?
How different two colors need to be before they're counted as "different." Raising it picks up on subtle differences (like anti-aliasing or slight compression noise); lower it if you only want meaningfully different changes to show.
A tiny shift in text position is highlighting a huge area.
That's expected with pixel-level comparison — even a few pixels of movement can make a whole region register as different. This approach isn't a good fit if you want to ignore layout shifts and only see content changes.
Can I compare images of different sizes?
Yes, but image B gets resized to match image A, so results are less meaningful if the aspect ratios are very different. Best results come from screenshots taken at the same resolution.