# Invisible Watermark

> Marks a copy of a passport, ID card or private photo with an invisible code naming who it was sent to. If the picture leaks, the free check names the copy. Pictures are never stored. Hosted in the European Union, GDPR compliant.

Pricing: first 3 pictures free without an account, then credit packs, coming soon.

## Pages
- [Home](https://watermarkdocument.com/): mark a picture or check a picture you found
- [Skill for AI agents](https://watermarkdocument.com/agents/skill.md): mark and check pictures from Claude, Codex or any agent (REST API and MCP server at https://watermarkdocument.com/mcp, API key from the account)

## Guides
- [How to watermark your ID before you send a copy](https://watermarkdocument.com/guides/send-id-copy-safely): Give every landlord, bank or employer their own copy of your ID, invisibly marked with who it's for. A free check shows whose copy it was.
- [How to find out who shared your photo](https://watermarkdocument.com/guides/find-who-leaked-a-photo): Mark each copy of a photo with who you sent it to. The mark is invisible and stays through screenshots, and a free check tells you whose copy it was.
- [Visible or invisible watermark: why invisible wins](https://watermarkdocument.com/guides/visible-vs-invisible-watermark): Because it's invisible: post or send the picture as it is, mark included. A visible watermark spoils the picture and can be cropped off or erased by AI in seconds.
- [How creators can trace where their photos end up](https://watermarkdocument.com/guides/watermark-photos-for-creators): Mark every photo you send to a brand, an agency or a client with an invisible note of who it's for. If it's reposted, a free check shows your mark.