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Mark your AI text. Anyone can check it, free.

Paste text your AI wrote. Encypher adds an invisible, signed C2PAC2PA: The Coalition for Content Provenance and Authenticity: the group that publishes the open standard for content labels. label to each sentence that says AI made it. Then check it, the way anyone else would.

Mark your AI output

Paste AI text, mark it, verify it live

More demos: try it yourself, no accountfor publishersAI chatbot with signed answersprivate team walkthroughAuthorized Supply (Ad Tech)

Mark, record, check.

The EU AI ActEU AI Act: The European Union's law on artificial intelligence, which includes rules for marking AI-made content. (Article 50Article 50: The EU AI Act rule that AI-made content be marked in a form software can read, and deepfakes disclosed.) asks for machine-readable markingMachine-readable marking: A label software can read that says content was made or changed by AI. of AI output. It applies August 2, 2026 for new systems, December 2, 2026 for systems already on the market.

Send a file to the signing API, get it back signed with the label inside, and anyone can check it for free without an Encypher account.
Signing is one API call. Checking is free and needs no account.

  1. Mark

    Our APIAPI: Application programming interface: a way for one program to ask another to do a job, such as sign a file. puts a signed C2PA label into your AI output as it is made, sentence by sentence.

  2. Record

    Each marked item gets a public check link. Paid plans add an Article 50 evidence record per item.

  3. Check

    Anyone can check it 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..

Check a source your model read.

Paste one source and see whether it carries provenanceContent provenance: The record of where a piece of content came from and how it changed, carried with the content itself., a label you can check.

Provenance reads back a signed record: signed by Town Daily, made with AI: no, unchanged since signing. Detection runs unsigned text through an AI detector and returns a guess, such as 72 percent likely AI.
Provenance is a record anyone can check. Detection is a guess with a score.

1. Ingest a source

Paste or upload content your AI consumed

Single-source checks are live. Checking a whole pipeline is a partner program.

Start free. Pay when you grow.

Free
$0. 1,000 marked AI outputs and 5 evidence records a month, plus free public checks.
Starter
$99/mo. 10,000 outputs per month, Unlimited Article 50 evidence records, One-click evidence summary, and more.

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Create. Mark. Endure.

Mark your first AI output in a minute. No setup and no API key.

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