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How to tell if a photo was edited

You usually can't tell by looking. Modern editing, and now AI editing, leaves no visible seams, so the question moves from the pixels to the file. A photo's file records what software touched it and when, and editors are surprisingly honest about signing their work. Reading those records won't catch every manipulation, but it catches most real-world ones, because most people who alter photos never think about the file.

The software trail

A photo straight off a camera or phone carries the device's own processing signature. Run it through an editor and the software field changes: the editor writes its name into the file it saves. When a photo claimed as "straight off my phone" carries an editor's signature, the claim and the file disagree. The reverse matters too: phone camera apps that apply automatic processing are normal and expected; a built-in HDR pass is not "editing" in any meaningful sense. The question is always whether the processing history fits the photo's story.

The timestamp gap

Capture time and last-saved time are separate fields. On an untouched photo they match to the second. A save time hours or days after capture means the file was written again by something, an edit, a conversion, an export. The gap doesn't say what changed, only that the file you're holding is not the file the camera wrote, and on a photo being used as evidence, that's the fact that matters.

When metadata is gone entirely

Stripped metadata is the most common state for photos that traveled through messaging apps and social platforms, so it can't be treated as proof of tampering. But context changes its weight. A photo offered as original proof, delivered as a bare file with no capture record at all, where the sender controls the source, deserves the follow-up: send it from the camera roll, or share the original by a channel that preserves metadata.

FAQ

Can editing ever be invisible in the file too?

Yes. A careful person can edit a photo and rewrite the metadata to match the original story. File evidence catches the common case, not the determined forger, which is why high-stakes photos should be verified at their source.

Do filters and cropping count as edits?

To the file, yes: any re-save updates the processing history. Whether they matter depends on the claim. A cropped vacation photo is nothing; a cropped damage photo that happens to remove pre-existing damage is the whole story.

What about AI-generated photos?

Fully generated images carry no real capture record, no device, no real scene. They fail the provenance test the same way screenshots do: silence where a camera's testimony should be.