Check if a file was made with Claude
Heat trend
Collecting trend data
The percentage is based on available heat signal, not comment count or independent people.
Check if a file was made with Claude
Check a file
Drag and drop or click to add a file.
Supported formats: JPG, PNG, GIF, WEBP, TIFF, HEIC, AVIF, SVG, DNG, JXL, MP4, MOV, AVI, WAV, MP3, M4A, FLAC · up to 100 MB
What the tool is
Claude marks content it makes in two ways:
- Text gets a watermark in the writing itself, for example an e-mail or essay Claude drafts
- Files get a content credential—signed provenance metadata that is attached when you download, for example, a chart Claude created.
This tool identifies only the content credential, which tells you whether Claude was involved in producing the file. It can't tell whether Claude was involved in creating the content, and it does not include any identifying information about the user.
How it works
When Claude produces a supported file type (such as a .png, .jpg, or .svg), it will attach a content credential in the form of a small, cryptographically signed note in the file’s metadata, saying that the file was made or processed with Claude.
This is an open industry standard called C2PA—the same used by camera manufacturers and in photo-editing software to record where an image came from. Any C2PA-aware tool can read it
If we find one that points to Claude, we'll tell you here.
Similar tools are available from other model providers ( OpenAI , Google DeepMind , Gemini ).
How can I tell if Claude created the text?
To detect watermarks embedded in text we have a Detection API which is currently in private preview to eligible organizations as required under EU law.
Read more about file and text detection here .
What happens to the file you upload
- Your file stays on your device.
- The checker only reads the embedded credential, not the file itself.
- Your file is never stored or used for any other purpose.