ClaudeMap

Check Files

Anthropic's on-device C2PA content-credential detector — check whether a file was issued by Claude, without uploading it.

SDKs & Toolingofficialc2paprovenancedetection
Visit project

An official browser-based detector from Anthropic PBC: drop a file and it checks for an encrypted content credential (C2PA) issued by Claude, entirely on-device ("Your file stays on your device"). Supports 17 formats — JPG/PNG/GIF/WEBP/TIFF/HEIC/AVIF/SVG/DNG/JXL images, MP4/MOV/AVI video, WAV/MP3/M4A/FLAC audio — up to 100MB. It verifies credential existence only — not the degree of Claude's involvement — and text watermark detection is not included (the Detection API is in private preview).

What it does

  • Browser-based and entirely on-device — the checker only reads the attached credential, not the file itself, and files are never stored or used for any other purpose
  • Credentials use C2PA, the same open industry standard as camera manufacturers and photo-editing software; any C2PA-aware tool can read them
  • Supports 17 file formats up to 100 MB: JPG, PNG, GIF, WEBP, TIFF, HEIC, AVIF, SVG, DNG, JXL (images); MP4, MOV, AVI (video); WAV, MP3, M4A, FLAC (audio)
  • No install — runs in the browser at claude.com/check-files

When to use it

Verify a file's provenance before trusting or resharing it — e.g. whether an image or audio clip circulating internally was made or processed with Claude.

Getting started

No install — open https://claude.com/check-files in a browser.

Things to know

Checks credential existence only: it doesn't tell you who authored the underlying content or how much Claude was involved. Does not check text — text watermark detection is a separate Detection API, currently in private preview for eligible organizations as required under EU law.

Charted

Related on the map

  • Harness Bridge

    SDK / Tool

    A local launcher that points Claude Code and seven other coding harnesses at any OpenAI-, Anthropic- or Responses-compatible endpoint — without editing a single config file.

    • launcher
    • local-models
    • cli
    • menu-bar
    View

  • Claude for Siri

    SDK / Tool

    Answers macOS Spotlight and Siri prompts with your signed-in Claude Code account — an experimental macOS 27 model-delegation provider.

    • macos
    • siri
    • spotlight
    • model-delegation
    View

  • AI Coding Assistant Data Extractor

    SDK / Tool

    Extract your own local chat history from ten AI coding assistants into one normalized JSONL — for fine-tuning, analytics, or backing up years of conversations. Standard library only.

    • cli
    • data-export
    • jsonl
    • backup
    View