Compare two photos
Add two images to see if one is a copy of the other, even after cropping, resizing or a filter. You get a match score, the differences marked, and the details of both files side by side.
Both images are compared in your browser. Neither is uploaded.- 1Add both photos
- 2See the match
- 3Use the evidence
No photos to hand?
Both images stay on this device. How do we know?
How to compare two photos
To compare two photos, add both images above. The tool looks for one image inside the other at many sizes, the normal way round and mirrored, so it still finds a match after cropping, resizing, flipping or a color filter. You get a match score, an outline of the matching area, red marks where the two differ, and the size, date and camera details of both files side by side. Both images stay on your device. To check if someone copied your photo, put your original first.
How the comparison works
You can compare any two images, but the tool is built for one question in particular: is this picture a copy of mine? Put your original first and the copy second, and the results say what was changed and what in your file shows the photo is yours.
Both images are shrunk to small grayscale versions, then the copy is slid across your original at many sizes, the normal way round and mirrored. Each position gets a score for how well the shapes line up. Working in grayscale means a color filter or a brightness change doesn't hide a match, and testing many sizes catches crops and resizes.
The best position becomes the match score and the outline on your original. Then the two are compared block by block, and blocks that differ much more than the rest are marked in red on the copy. That's usually a name, logo or watermark stamped on top, or something cropped out and painted over.
The checker also searches the other way round, for your photo inside the copy. That finds copies with a border, a caption or a meme template around your picture.
What counts as evidence
A match tells you the copy is your picture. What shows it's yours is mostly in your original file:
- Size. Copies are almost always smaller. Social media and websites shrink photos, and nobody can add detail that wasn't there.
- Date and camera details. Phones and cameras record when a photo was taken and with what. Copies taken from social media usually have none of it, because the platforms strip it.
- Your name or copyright notice, if your camera or editing app adds one.
- Content Credentials, a signed record some cameras and apps add.
The side-by-side table shows each of these for both files. Our guide on how to prove a photo is yours covers the evidence that sits outside the file, like other shots from the same moment.
What to do next
Click Copy this summary to get a plain-text version of the results, or Write a takedown notice to go to the DMCA takedown notice generator with the summary filled in. If you're not sure where to start, read someone stole my photo: what to do.
This page explains how things usually work, in plain words. It’s general information, not legal advice, and rules differ by country. For a decision that matters, talk to a lawyer. Terms
Questions, answered
Can I download the result as a report?
Yes. Download report (PDF) saves both pictures, what was changed, the evidence that the original is yours, the file details side by side, and a SHA-256 fingerprint of each file, with the date and time. It's made on your device, so nothing is uploaded. Keep it with your original files for a takedown notice.
Can it tell who took the photo first?
Not on its own. A match shows the two files are the same picture. Who took it is shown by other evidence: your full-size original, the date and camera details inside it, other shots from the same moment and any RAW files. The checker lists what your file has.
Does it work if the copy was cropped or filtered?
Yes. It searches for the copy at many sizes and positions, mirrored as well as normal, so crops, resizes and flips are found. Color filters and brightness changes don't stop a match. A rotated copy needs rotating back before you compare.
How do I compare two images for similarity?
Add both images above. The match score shows how similar they are once size, position and color are taken into account: around 80% and up means the same picture, and lower scores mean heavy edits or a different photo. The marked areas show exactly where they differ.
Are my photos uploaded?
No. Both images are read and compared in your browser, so they never leave your device. You can check: load the page, turn off your internet, and the comparison still works.
How do I find copies of my photo online?
Use a reverse image search such as Google Lens, Bing Visual Search or TinEye. Give it your photo and it lists pages that show the same or a similar image. Save each copy you find, or take a screenshot, then compare it here.
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