// HACKER NEWS — CYBERSECURITY
Check if a file was made with Claude
Supported formats: JPG, PNG, GIF, WEBP, TIFF, HEIC, AVIF, SVG, DNG, JXL, MP4, MOV, AVI, WAV, MP3, M4A, FLAC · up to 100 MB
This tool runs in your browser. Your file never leaves your device. By using this tool, you agree to Anthropic’s Usage Policy (opens in new tab) and acknowledge our Privacy Policy (opens in new tab).
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.
The content credential tells you that Claude was involved in producing the file.
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).
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.