Two kinds of mark.Two tools. Mixing them up wastes a credit.
Use a rewrite when the mark is statistical — a ChatGPT, Claude or Gemini 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.
Reviewed by Can Balkaya
Published
Process
How to verify the job
01
Identify the surface
Use inspection to distinguish deletable Unicode or file metadata from a statistical pattern in ordinary words.
02
Choose one action
Clean named bytes from a string or file, or rewrite prose when the signal lives in word choice.
03
Verify only what is verifiable
Confirm removed characters and metadata independently; do not treat a rewrite as a detector certificate.
Scope
Supported and unsupported surfaces
| Surface | Gifi action | Verification limit |
|---|---|---|
| Named metadata or invisible Unicode | Inspect, remove, and report named actions | Reinspect the returned bytes independently |
| Statistical patterns in ordinary words | Rewrite the prose | No certificate against a private detector |
| Visible logos, pixels, audio, or video | Unsupported | No removal claim |
If the mark is in the words
SynthID-Text does not add characters. It biases which token the model picks at each fork. Light edits usually keep that trail. A rewrite chooses different words, which breaks the keyed sequence.
We cannot see any vendor’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 a 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.