The marks are not all the same.Neither are the tools.
Start with the two flagship explainers if you want the mechanism. The shorter guides answer a single long-tail question without promising more than Gifi can do.
By model
- ChatGPT watermarks: files and audio, not textOpenAI. The picture and the voice already carry marks.
- Claude text watermark: a pre-publish workflowAnthropic. It is which word came next.
- Gemini text watermark vs visible image marksGoogle. It has been in the product for years.
- Copilot text watermarks and document metadataMicrosoft. Microsoft signed the same code.
- Llama text watermarks: local vs hosted outputMeta. Meta’s key stays with Meta.
- Mistral text watermarks: what is publicMistral. They have not said with what.
Long-tail guides
- Does ChatGPT watermark text?As of August 2026 ChatGPT does not watermark text. Images carry C2PA and SynthID. Supported audio carries SynthID. openai.com/verify is not a text detector.
- What SynthID-Text isSynthID-Text tilts which ordinary word a model picks. Gemini uses it in production. The detector key is private. Pixel SynthID is a different mark.
- AI text watermarks vs AI detectorsA statistical text watermark is a keyed pattern the provider wrote into word choice. An AI detector score is not that mark. Gifi is not a detector API.
- Why paraphrasing does not remove a text watermarkStatistical text watermarks are built to survive synonym swaps and light edits. A rewrite spends a credit to change the wording. It still cannot certify a vendor detector.
- EU AI Act text marking and Article 50Article 50 asks providers of generative systems to mark output as machine-readable. That duty is not satisfied by cleaning a file or rewriting prose. Gifi does not replace a disclosure the law requires.
- How to remove C2PA Content Credentials from a fileInspect and remove an embedded C2PA Content Credential while understanding why soft binding can still reconnect a remote manifest.
- How to remove EXIF and GPS from photosEXIF and XMP store camera, time and often GPS coordinates inside a photo. Gifi strips those fields from JPEG, PNG and WebP without re-encoding the image.
- How to clean metadata from a PDFRemove PDF author, date, XMP, and local C2PA metadata with a structural rebuild that drops the old unused objects.
- When to rewrite text, and when to strip a fileUse a rewrite for an AI word-choice signal; use cleaning for C2PA, EXIF, document properties, or invisible Unicode that can be named.
- Invisible Unicode vs AI text watermarksFind and remove zero-width spaces, tag characters, and byte-order marks without confusing them with a statistical AI text signal.
- How to remove metadata from a Word DOCX fileRemove author, company, revision, comment-author, thumbnail, and embedded-image metadata from a Word DOCX file while preserving its document content.
- Pre-publish checklist for AI-assisted contentA repeatable pre-publish checklist for agency teams using AI-assisted drafts: preserve the source, inspect hidden surfaces, verify claims, review disclosures, and record approval.
- Client-file metadata checklist before deliveryA practical client-delivery checklist for DOCX, PDF and image metadata, including Document Inspector, embedded assets, filenames, verification and handoff records.