Free content provenance tools Check a label in seconds.
Check who signed a file and whether it changed, sign a sample, or see where you stand on the EU AI ActEU AI Act: The European Union's law on artificial intelligence, which includes rules for marking AI-made content.. Most tools need no account.
Pick a tool
- WordPress PluginSign every post when you publish. Free for publishers.
- Sign & VerifySign a piece of text, then check it.
- VerifyCheck the label on text, an image, audio, video or a document. No account.
- EU AI Act Readiness CheckSeven questions, then a one-page readiness report. No signup.
- AI Cost & Exposure ReportScan a news site for labels, crawler rules and AI exposure. No signup.
- Chrome ExtensionSee labels on any web page as you browse.
- C2PA Workflow ArchitectMap where your team signs, checks and edits files.
One engine behind every tool
- Each tool signs and checks with the same engine as our production APIAPI: Application programming interface: a way for one program to ask another to do a job, such as sign a file.. It covers 75+ formats for signing and verification.
- Labels follow the open C2PAC2PA: The Coalition for Content Provenance and Authenticity: the group that publishes the open standard for content labels. standard. Encypher wrote its method for unstructured textUnstructured text: Text with no file around it, such as an article body, a post or a chat reply, so there is no container to hold a label., published January 8, 2026.
- Anyone can check a label for free, with no account and no API keyAPI key: A secret string that identifies your account when your software calls an API. Keep it out of public code..