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Provenance Lens

Text watermark detection

Check which LLM text watermarks are verifiable today. Inspect Unicode and zero-width signals, with sourced support status for provider-specific marks.

Updated: Published by Provenance Lens

What Provenance Lens checks4
  1. C2PA Content CredentialsC2PA 2.2Check available
  2. Embedded metadataXMP / EXIF / IPTCCheck available
  3. Unicode anomaliesUnicodeCheck available
  4. Anthropic text watermarkProvider-specificNot checkable

Support status

C2PA Content Credentials

Check available

Source

Embedded metadata

Check available

Source

Unicode anomalies

Check available

Source

Anthropic text watermark

UNSUPPORTED

Source

Anthropic image C2PA

Check available

Source

Evidence, not guessing

Provenance Lens reports only what can be checked: a cryptographically signed manifest, a metadata field, a specific codepoint, a documented provider mechanism. When a signal cannot be checked, it says so. It never converts silence into a verdict.

What a report cannot prove

  • A valid signature proves who signed a manifest, not that the manifest's claims are true.
  • Metadata is trivially editable. Treat generator fields as an indication, never as proof.
  • Hidden Unicode characters have many innocent causes, including ordinary copy-paste.

Runs in your browser

The check runs in your browser. Your file is not uploaded — it never reaches our servers. You can verify that in your browser's network tab while a scan runs.

Primary sources