OpenAI Watermark Checker
Use one evidence-based check for supported OpenAI C2PA and SynthID provenance signals in uploaded files.
What this checker can verify
- Supported OpenAI image C2PA and SynthID results when the official API is configured.
- Supported OpenAI audio SynthID results when the official API is configured.
What it cannot verify
- Whether a file without a signal was not made by OpenAI.
- Authorship, factual accuracy, or rights ownership.
How to interpret the result
OpenAI provider results are shown separately from local metadata and C2PA evidence. A missing signal can result from stripping, transformations, legacy output, or unsupported content.
No supported signal detected does not prove a file was created by a human. Metadata and credentials can be removed by screenshots, exports, editing, compression, or unsupported services.
Frequently asked questions
Is this affiliated with OpenAI?
No. It uses supported OpenAI verification where configured and does not imply affiliation.
What happens when the provider is unavailable?
Local C2PA and metadata checks still run and the partial coverage is shown.