How to check OpenAI and ChatGPT image provenance: official OpenAI verification versus local Content Credentials inspection. AI Watermark Center does not detect SynthID.
Searching for an “OpenAI watermark detector” or “ChatGPT image watermark detector” usually means two different products. OpenAI can check supported OpenAI provenance signals. AI Watermark Center can inspect embedded C2PA in supported JPEG, PNG, and WebP. It cannot detect SynthID. Do not treat AI Watermark Center as an OpenAI watermark detector.
OpenAI official verification
Public provider tool. Looks for supported OpenAI C2PA and SynthID on supported images, and SynthID on supported audio. Result is provider-verified. OpenAI documents a Content Provenance API for supported image and audio files. AI Watermark Center does not integrate that API and does not upload user files to OpenAI.
AI Watermark Center
Embedded Content Credentials in JPEG, PNG, and WebP, in the browser. No OpenAI upload. AI Watermark Center does not currently detect SynthID. Missing C2PA does not mean the file is not OpenAI.
Help Center documentation points to openai.com/verify for supported image and audio files. After upload, the tool looks for supported OpenAI signals such as a SynthID watermark or a trusted C2PA manifest associated with OpenAI. If it finds one, OpenAI says the content was generated by, or exported from, OpenAI tools. That is not a verdict on factual accuracy or ownership.
A result from OpenAI Verify or the Content Provenance API is a provider-verified result, not an independently generated AI Watermark Center detection.
A not_detected result does not prove that a file was not generated by OpenAI, that it is human-created, or that it has no AI provenance. Metadata may have been stripped, a watermark may have degraded, the file may predate provenance features, or it may come from an unsupported path or another system. Do not translate not_detected into clean, human, or not AI.
Official OpenAI verification (opens in a new tab)External provider tool
This site inspects supported embedded C2PA locally. It does not send the file to OpenAI just because this page links to official verification. Following that external link is a separate, intentional step using OpenAI’s own upload flow.
Provenance signals (Content Credentials, SynthID) in OpenAI-generated content — OpenAI Help Center
Accessed August 17, 2026.
Primary source for current OpenAI image C2PA + SynthID on supported ChatGPT, Codex, and API outputs; audio SynthID; prompt-requested visible disclosure; and openai.com/verify. Visible marks are separate from embedded signals.
Verify — OpenAI
Accessed August 17, 2026.
Public verification surface referenced by OpenAI Help Center for supported image and audio provenance signals (C2PA and/or SynthID). External provider tool — not an AI Watermark Center feature.
Content provenance — OpenAI API documentation
Accessed August 17, 2026.
Content Provenance API (also referenced as OPENAI-API-PROV-001 in Phase 7 notes). Images: C2PA + SynthID. Audio: SynthID. Documents not_detected semantics. Public/documented; not integrated by AI Watermark Center.