C2PA Content Credentials
Reads embedded content credentials and manifest data.
- Upload an image to run full server analysis.
SynthID checker
SynthID Checker
Upload one image and check for supported Google SynthID, C2PA, and AI provenance signals in a single review workflow.
SynthID
Google watermark signal
C2PA
Signed provenance
Limits
No signal is not proof
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JPG, PNG, WebP, or AVIF up to 10 MB
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JPG, PNG, WebP, or AVIF up to 10 MB
Upload runs browser-side C2PA first. Full server analysis checks SynthID-capable provider signals only when the relevant API keys are configured.
Summary
Waiting for image upload
Upload an image to run full server analysis.
Detection channels
OpenAI / Google / Adobe provenance
Looks for trusted signer, claim generator, and AI provenance evidence.
- Server check required
Google SynthID
Checks for Google AI invisible watermark signals through Gemini/SynthID capability.
- Server check required
Meta Stable Signature / Seal
Checks Meta/Stable Signature style watermark signals through an optional adapter.
- Server check required
Generic AI fingerprint
Calls a generic AI image detector model as a secondary signal.
- Server check required
Basic metadata signals
Records format, size, dimensions, and cache hash evidence.
- Server check required
A detected SynthID signal is strong evidence of supported AI provenance. No SynthID signal only means this workflow did not find a supported Google AI watermark or related signal.
What this SynthID detector checks
SynthID is a watermarking system for AI-generated media. This page is built around the specific search intent behind SynthID checker, SynthID detector, and Google AI watermark queries.
Last updated: June 1, 2026
SynthID signal
Checks for supported provider evidence that an image may carry a Google AI invisible watermark.
C2PA fallback
Reads Content Credentials locally first, because signed provenance can provide strong origin evidence.
No-signal context
Separates no SynthID found from not AI-generated, which is the most important interpretation gap.
What SynthID can and cannot detect
A SynthID checker is most useful when it finds a supported Google AI watermark or related provenance signal. It should not be treated as a universal detector for every AI image on the web.
Can help identify
- Images or videos with supported SynthID watermark evidence.
- Files with C2PA Content Credentials that name Google, Gemini, Imagen, or another trusted AI source.
- Cases where a positive signal should be escalated for provenance review.
Cannot prove
- That an image is human-made when no SynthID signal is found.
- That unsupported AI generators, screenshots, or heavily recompressed files are clean.
- Whether the visual claim in an image is true, misleading, or edited after generation.
How to interpret SynthID results
Treat SynthID as a high-value provenance signal, not a universal AI detector. The result is strongest when the watermark or signed provenance is found, and limited when no supported signal is available.
Detected
A detected SynthID-related signal is strong evidence that supported AI provenance exists in the image. It does not explain whether the image is accurate, misleading, or edited after generation.
Not found
No SynthID signal means no supported Google AI watermark was found. The image may still be generated by another AI system or may have lost signals during editing or reposting.
Inconclusive
Simple images, tiny edits, screenshots, compression, or damaged files can make provenance review less clear. Keep these cases in a manual review workflow.
SynthID vs C2PA vs metadata
AI provenance is easier to understand when invisible watermarks, signed credentials, and ordinary file metadata are reported separately.
Signal
What it can show
Main limitation
SynthID
Whether supported AI watermark evidence is present.
Coverage depends on the generator, file history, and available detector capability.
C2PA
Signed provenance, tool names, edit history, and AI-use declarations.
Metadata can be stripped, invalidated, or stored remotely by some tools.
Metadata
File type, dimensions, size, and sometimes camera or editor details.
Easy to remove or rewrite, so it is context rather than proof.
Related AI watermark tools
Use the broader checker when you want to review SynthID alongside C2PA, metadata, and other AI watermark signals.
Reference sources
These official references explain how SynthID, signed provenance, and provider verification tools should be interpreted.
Google DeepMind SynthID
Official overview of Google's invisible watermarking system for generated media.
Gemini SynthID Verification
Google help documentation for checking supported AI-generated images and videos with SynthID.
C2PA open standard
The provenance standard behind Content Credentials and signed media records.
OpenAI Verify
Example of a provider verification workflow for supported provenance signals.
SynthID checker FAQ
Practical interpretation details for Google AI watermark checks.
A SynthID checker looks for supported Google AI watermark and provenance signals. It is useful for reviewing images that may have been generated or edited with Google AI tools.
No. A missing SynthID signal only means the checker did not find a supported Google AI watermark or related signal. The image could still come from another AI system, an older model, or a file where signals were damaged.
Watermarks are designed to survive common edits, but screenshots, heavy recompression, cropping, format conversion, or repeated edits can still reduce detection confidence.
SynthID is an invisible watermark embedded into generated media. C2PA Content Credentials are signed provenance records that can describe origin, editing history, and whether AI tools were used.