Evidence-led explainers
AI watermark guides for text and images
Hidden Unicode, statistical text marks, C2PA metadata, and pixel watermarks are different systems. These guides explain what each signal means, how it can be checked, and which removal claims can be verified.
Choose the check by signal type
| Signal | Where it lives | Required check |
|---|---|---|
| Invisible Unicode | Exact text code points | Code point scanner |
| Statistical text watermark | Token-selection pattern | Compatible vendor detector |
| C2PA Content Credentials | Embedded or referenced manifest | Parser and, for trust, full validator |
| Pixel watermark | Image content | Compatible pixel detector |
Technical terms follow the Unicode Standard, the C2PA specification, and published vendor documentation. Last reviewed August 12, 2026.