You've switched off location and there's no serial number in your photos. Can someone still tell that several of them came from you? Often, yes. Every photo carries a set of shared details about the phone and apps that made it, and together those act like a fingerprint. Here's how to see yours and how to remove it.
What a photo's fingerprint is
None of these details is unique on its own. Millions of phones share each one:
- the phone's firmware or software version
- the colour profile the camera writes
- the time zone the phone is set to
- the image size, and the size of the preview stored inside the file
- the settings the camera app writes its own way, and the way it compresses the picture
Together they narrow things down quickly: one phone model, on one software release, in one time zone. Post photos from that phone on different accounts and they all carry the same pattern, so they can be linked to each other, and to you.
That's different from tracking. A serial number or unique ID points to one device or file on its own. Can a photo be tracked back to you? covers those.
Check your own photo's fingerprint
Upload a photo for a check and open the Fingerprinting section of the report. It lists every shared detail found. Here's one of our own, taken on a Samsung Galaxy A56:
Twenty-five details. Not one of them names the owner, but together they describe that phone model on that exact software release, set to that time zone.
How to remove it
- Upload the photo to snapWONDERS Convert and switch on Strip Metadata.
- Keep the output as JPEG, or pick another format. Convert writes a fresh copy of the picture either way.
- If the image size matters to you, set a Max width as well. Stripping doesn't change the size.
Removing the details alone isn't quite enough. A JPEG carries the compression settings its camera used, and those aren't stored as metadata, so a tool that only deletes metadata leaves the camera's own settings in place. Convert writes the picture again with its own standard settings, which a huge number of other files share.
Then check it worked
Run the converted copy through a check and look at the Fingerprinting section again. When we did this with the photo above, 25 details went down to one:
The one left is the encoder. It's now the converter's standard setting, not Samsung's. The capture times, the make and model, and the records Samsung stores after the picture were gone too. The image was still 4000 × 3000, because we didn't resize it.
What removing it can't do
What's in the picture stays in the picture. The scene, the people, your style and when and where you post can all link photos together too. And the platform you post to sees your original upload before it changes anything, so remove the fingerprint before you upload, not after.
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