Can I strip Claude’s text watermark like EXIF?

No. There is nothing to delete. The mark is the path through the vocabulary, not a hidden character.

Can I rewrite a JPEG to remove C2PA?

No. Rewriting is for prose. A photo needs the file cleaner.

Which should I do first?

Inspect first. The home page will show invisible characters in text, and what metadata a file is carrying, before you sign in.

Rewrite · Strip

Two kinds of mark. Two tools. Mixing them up wastes a credit.

Use a rewrite when the mark is statistical — Claude’s SynthID-Text trail lives in the words the model chose. Use a strip when the mark is in the file: C2PA credentials, EXIF, XMP, document properties, or invisible Unicode. Gifi will not pretend one credit does both jobs, because they have different costs and different standards of proof.

If the mark is in the words

SynthID-Text does not add characters. It biases which token Claude picks at each fork. Light edits usually keep that trail. A rewrite chooses different words, which breaks the keyed sequence.

We cannot see Anthropic’s key, so we cannot certify their detector. A rewrite changes the prose. That is all an honest tool can say.

If the mark is in the file

C2PA, EXIF, XMP and Office/PDF properties are bytes with names. They can be listed, then deleted. Invisible Unicode — zero-width spaces, tag characters, a byte-order mark — is the same idea inside a string. The home-page paste shows those characters before you spend anything.

Stripping a file does not disturb a statistical text watermark in a caption. Rewriting a caption does not remove GPS from the photograph beside it.

What a credit buys

One credit is one rewrite candidate, or one file cleaned. Pasting on the home page is free. Continuing a rewrite, or sending a file to be stripped, is the paid work that runs on our machines.

Questions this usually raises

Can I strip Claude’s text watermark like EXIF?: No. There is nothing to delete. The mark is the path through the vocabulary, not a hidden character.
Can I rewrite a JPEG to remove C2PA?: No. Rewriting is for prose. A photo needs the file cleaner.
Which should I do first?: Inspect first. The home page will show invisible characters in text, and what metadata a file is carrying, before you sign in.