Free · browser-side · no uploads
Check what AI made this file
AI Watermark Checker reads AI provenance — Content Credentials (C2PA), generator claims, action history and metadata hints — without uploading anything. Drop an image and see the receipts.
Runs entirely in your browser — your file is never uploaded.
Drop an image here, or browse files
JPEG · PNG · WebP — up to 25 MB. Files are read locally and never uploaded.
Quick answer
Major AI vendors now mark their output: Claude embeds signed C2PA Content Credentials in files it produces and runs a SynthID-derived watermark through its text; OpenAI embeds C2PA metadata in image generations; Google pairs SynthID pixel watermarks with C2PA metadata. AI Watermark Checker reads the layers that are publicly verifiable — locally, for free.Coverage by vendor
| Source | What it leaves behind | Can you check it? |
|---|---|---|
| Anthropic Claude | SynthID-Text watermark in text; signed C2PA Content Credentials in .png/.jpg/.svg files | Files: readable anywhere (ours included) · Text: needs Anthropic's key |
| OpenAI (GPT Image / DALL·E) | C2PA metadata embedded in generated images | Readable here ✔ |
| Google Gemini / Imagen | SynthID watermark + C2PA metadata | C2PA: readable here ✔ · SynthID: official portals only |
| Adobe Firefly | Content Credentials | Readable here ✔ |
| Midjourney / Stable Diffusion | typically none (plain files) | no provenance data to read |
Frequently asked
Does this upload my file anywhere?＋
No. Files are parsed with JavaScript directly in your browser; nothing is transmitted or stored. You can even disconnect from the internet after the page loads.
If no provenance is found, does that mean a human made it?＋
No — absence is not evidence. Human camera photos often have no concept of provenance to check, but AI images can also lose metadata through screenshots, re-encodes, and platform processing, and some vendors never embedded any.
Can you detect Google SynthID pixel watermarks?＋
Not from the pixels themselves. SynthID requires Google's own detection gates (SynthID Detector and the Gemini app). We read independent layers like C2PA credentials, which Google also attaches to generated images.
Is AI Watermark Checker affiliated with Anthropic, OpenAI, or Google?＋
No. We are an independent reader of open standards (C2PA / JUMBF). Trademarks on this site belong to their respective owners.
Sources
- Anthropic — How Claude's text watermark works (Aug 14, 2026; updated Sep 1, 2026) — accessed 2026-09-29
- Google DeepMind — SynthID — accessed 2026-09-29
- C2PA — Content provenance specification — accessed 2026-09-29
- OpenAI — Enhancing media provenance with C2PA metadata (Feb 2024) — accessed 2026-09-29