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Sign and verify text

Paste a paragraph and sign it. The text gets an invisible C2PA manifestC2PA manifest: The signed label itself: a small package inside a file that records who signed it, what they declared and how to check it. that shows who signed it and whether it changed. Then check it in the free verifier.

Sign a sample

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What signing adds

Readers see only the words of a paragraph: The town pool opens Monday at noon. Lifeguards are on duty until 6 p.m. A faint gold stitch under the lines stands for the signed label carried unseen inside the words. A checker reads it back: signed by Town Daily, made with AI: no, unchanged since signing.
The signed label travels inside the words without changing how they look. Anyone can check who signed, what they declared about AI, and whether the text changed.

Signing adds content provenanceContent provenance: The record of where a piece of content came from and how it changed, carried with the content itself. to the text: who signed it and when.

The label rides in characters that draw nothing on screen. The words look the same, and any edit shows up when you check them.

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Create. Mark. Endure.

Sign your own work with your name on the label.

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