How do you check an image for an AI watermark?
Start by identifying the layer. A visible logo, a pixel watermark, signed C2PA provenance, and ordinary image metadata require different checks—and a trustworthy result says which one it actually tested.
Upload the original PNG, JPEG, or WebP file to the image watermark checker. It reads supported Exif, XMP, comments, editor data, and C2PA structures, then uses the official C2PA browser library to validate embedded Content Credentials. It does not guess from image style or claim to decode provider-only watermarks from pixels.
Which image-watermark layer can be checked?
| Signal | Where it lives | Checked here? |
|---|---|---|
| Visible logo or label | Rendered pixels that a person can see. | No. The checker does not use computer vision or edit pixels. |
| Pixel watermark such as SynthID | A signal embedded across image content and designed to survive some transformations. | No. Use the compatible provider detector. |
| C2PA Content Credential | A signed provenance manifest embedded in the file container. | Yes. Structure, asset binding, signature, validation failures, and configured trust are checked. |
| Exif, XMP, comments, or editor data | PNG, JPEG, or WebP container metadata. | Yes, for the supported fields and containers listed in the methodology. |
| AI-image classifier score | A model's inference from visual patterns. | No. The app does not send pixels to an AI classifier. |
What a C2PA result means
The checker distinguishes absent, present, valid, trusted, and invalid. A valid credential means the signed claim and asset still match. A trusted result additionally means the signer chains to the configured official C2PA trust list. It does not prove that the depicted event is true, that the file is copyright-free, or that no undisclosed edits occurred before signing.
See the complete Content Credentials validation guide.
Can you check an image for SynthID?
Not with a metadata parser. Google describes SynthID as an imperceptible signal embedded directly into generated image content and currently tells users to ask Gemini to check supported images. OpenAI likewise provides OpenAI Verify for supported provenance signals associated with its own tools. Those provider checks are separate from finding an Exif tag or a C2PA manifest.
A file may carry both layers. For example, current OpenAI documentation describes supported images as carrying C2PA metadata and SynthID. This browser checker can independently validate the supported C2PA layer; the corresponding provider service is required for an authoritative pixel-watermark result.
Why an original file is better than a screenshot
Saving through an app, converting formats, taking a screenshot, or posting to a platform can remove container metadata. A pixel watermark may behave differently because it lives in the image content, but it can also be weakened by transformations. Use the earliest available original file and interpret “not found” as a scoped result—not proof of human origin.
What can be removed without changing pixels?
The checker can create a new file without selected supported metadata or an embedded C2PA manifest. It rebuilds the container, parses the result again, and compares a SHA-256 fingerprint of retained render-relevant structures. If that identity changes, the download is blocked. Visible logos and pixel-level watermarks are not altered.
Audit the exact image rules and cleanup verification.
Primary sources
- Google DeepMind: SynthID and provider detection
- OpenAI: provenance signals in generated content
- Content Authenticity Initiative: inspecting Content Credentials
- AI watermark types, detection, and limits
Frequently asked questions
How do I check an image for an AI watermark?
Upload the original PNG, JPEG, or WebP file to the image checker. It inspects supported metadata and validates embedded C2PA Content Credentials locally. Pixel-level watermarks and visible logos require a different detector.
Can this checker detect SynthID in an image?
Not from pixels. SynthID is embedded into image content and requires a compatible provider detector. Google directs users to ask Gemini, while OpenAI Verify checks supported provenance signals associated with OpenAI content. This checker can independently find supported metadata and C2PA credentials in the same file.
Does no watermark found mean the image is not AI-generated?
No. Metadata can be stripped, a platform may use a different signal, and provider-only pixel watermarks are outside this local scan. A negative result means only that no supported file-level signal was found.
Does my image get uploaded?
No. The image bytes are parsed and cleaned in your browser. C2PA validation loads the public signing and timestamp trust lists, but the selected image is not sent with those requests.
Can the checker remove a visible watermark or logo?
No. It never paints, crops, regenerates, or changes image pixels. It can create a copy without selected supported metadata or an embedded C2PA manifest while preserving render-relevant image data.