SynthID Detector — Check Google AI & ChatGPT Image Watermarks

Free SynthID Detector · Content Credentials · AI metadata
Upload an image and this SynthID Detector reads the signed Content Credentials and AI metadata inside the file. You can see who signed it, whether the signature still checks out, whether the image declares AI generation and whether Google or OpenAI recorded an invisible SynthID watermark. Free, no account needed.
JPEG, PNG, WebP, AVIF or HEIC · up to 20 MB · use the original download, not a screenshot
The free check reads the file on our server and discards it. Nothing is stored.
About the SynthID Detector
SynthID is the imperceptible watermark Google DeepMind embeds in images, video, audio and text made with Google AI. Since May 2026 OpenAI applies it to ChatGPT and API images too. A SynthID Detector answers one question: does this file carry that watermark? Google reads the pixel watermark only in its own tools, so this SynthID Detector works from the evidence that travels with the file — the signed Content Credentials that state a SynthID watermark was applied — and links you to Google’s official SynthID Detector for the pixel check.
SynthID Detector checks an image for the provenance that AI image tools attach to their output. It reads C2PA Content Credentials and validates their signatures against the official C2PA trust list, scans EXIF, XMP and PNG metadata for AI generator fingerprints, and tells you when Google or OpenAI declared an invisible SynthID watermark. The free check runs on our server and the image is discarded afterwards. An optional AI visual analysis looks at the pixels themselves when the file carries no provenance.
Reads the C2PA manifest that Google, OpenAI, Adobe and other tools sign into their images, and validates the signature against the official C2PA trust list.
Shows when the signed credentials state that an imperceptible SynthID watermark was applied — the record Google writes into Gemini and Imagen images.
Scans EXIF, XMP and PNG text for IPTC AI source types and generator traces from Midjourney, Stable Diffusion, ComfyUI, Firefly, FLUX and more.
When a screenshot or re-upload has stripped every tag, an AI model inspects the pixels for generation artifacts and explains what it sees.
Drop a JPEG, PNG, WebP, AVIF or HEIC file up to 20 MB. Use the original download, not a screenshot, for the best result.
See who signed the Content Credentials, whether they validate, whether the file declares AI generation and whether a SynthID watermark is declared.
Run an AI visual analysis, or check the pixel watermark on Google’s official SynthID Detector with the same file.
Four kinds of evidence
Each layer answers a different question. Signed Content Credentials are the strongest evidence when present; metadata is useful but unsigned; the pixel watermark is read only by Google’s own SynthID Detector; and AI visual analysis is an informed estimate for files with no provenance left.
Cryptographically signed by the tool that made the image. Trusted signers include Google and OpenAI. Stripped by screenshots and most social platforms.
EXIF, XMP and PNG fields written by generators. Strong when present, but anyone can add or remove it.
Embedded in the pixels and robust to edits. Only Google’s official SynthID Detector can read it; this site reports whether one is declared.
An AI model’s estimate from visible artifacts. Useful when no provenance is left, never proof on its own.
We verified the Google, OpenAI and API-platform rows with original files on October 8, 2026; the other rows follow each company’s published Content Credentials practice. Every record survives only while the file is unchanged — a screenshot or social media upload removes it.
Independent vs official
Google’s official SynthID Detector decodes the watermark in the pixels, so it still works after a screenshot or a crop. It does not show the Content Credentials, the signer, the edit history or AI metadata from non-Google tools. This SynthID Detector shows all of that in one report, validates signatures against the C2PA trust list, and points you to the official SynthID Detector when the pixels are the only evidence left.
Credentials gone? Check the pixel watermark with Google, then come back for an AI visual analysis (1 credit).
New to SynthID? Read what SynthID is and how the watermark works, or use the Content Credentials checker to inspect any C2PA-signed photo or design.
Read results carefully
A positive result from signed Content Credentials is strong evidence: the AI tool itself declared the image as generated and signed that statement. A negative result is weak evidence. Provenance data is removed by screenshots, editing apps, messaging apps and most social networks, and many AI tools never add it. The pixel watermark is more durable but covers only images from companies that use SynthID. The AI visual analysis is an estimate. Use every SynthID Detector result together with the image’s source and context.
A SynthID Detector checks whether an image, video or audio file carries SynthID, the imperceptible watermark Google DeepMind embeds in content made with its AI models and, since 2026, by partners such as OpenAI. This SynthID Detector reads the signed Content Credentials and metadata that accompany those files and shows whether a SynthID watermark is declared, with a link to Google’s official detector for the pixel check.
No. Google has not released a public API that decodes the pixel watermark, so no independent site can read it reliably. This detector reads what the file declares — signed Content Credentials state when a SynthID watermark was applied — and links you to Google’s official SynthID Detector for the pixel-level check.
Yes. Uploading an image and reading its Content Credentials, signature status and AI metadata is free and needs no account. Only the optional AI visual analysis uses credits (1 per image).
Any image that still carries C2PA Content Credentials or AI metadata. That includes images downloaded directly from Google Gemini