Is it watermarked?
An AI watermark checker for text and images. Inspect content for provider watermark status, C2PA Content Credentials and hidden Unicode signals —evidence, not guesses.
Show the hidden characters inside the text
Copy cleaned text
Removes only the characters you select below (unusual spaces are replaced with a normal space). This is a transparency tool — it does not remove statistical watermarks and is not a way to hide AI use.
Official provider verificationClaude detection: announced
- ClaudeWatermark live in models since Aug 2, 2026. Public detection is announced — it plugs in right here the day Anthropic ships it.
- SynthIDText watermark live in Gemini — verification via Google for now.
- ChatGPT / OpenAINo text watermark deployed.
This page runs each official check the moment it becomes available — follow the rollout on the provider status page.
What you can check today
- C2PA Content Credentials in images — cryptographically signed provenance from Claude, ChatGPT, Firefly, cameras and more, validated in your browser.
- Hidden characters in text — zero-width characters, invisible Unicode, unusual whitespace, directional controls, with exact code points and positions.
- Current provider status — who watermarks what, verified against primary sources with a visible “last verified” date.
Clear evidence, clearly explained
Results show what the browser could verify in your content — not an AI-likelihood score. See how each result is produced.
Provider checkers & status
Claude
Anthropic marks Claude output since August 2026 — text watermark + C2PA files. Check what is verifiable today.
SynthID
Google’s watermark for images, video, audio and Gemini text — and the official ways to verify it.
ChatGPT / OpenAI
Images carry C2PA + SynthID since May 2026; text carries no watermark. Current status, explained.
C2PA / Content Credentials
The open provenance standard behind them all — verify any file’s credentials here.
Full comparison table: AI watermark & provenance status by provider.
From the blog
- Does Claude watermark text? What Anthropic’s 2026 marking actually means
- AI watermark checker vs AI detector: what’s the difference?
- How AI text watermarks work: statistical marks, hidden characters & provenance
- What are C2PA Content Credentials and what do they actually prove?
How results are produced and what the labels mean: methodology.