MarkLayer icon
MarkLayer icon

MarkLayer

Free, open-source tool to draw, highlight, and comment on any live webpage, then share one link for real-time collaboration.

Drawing, comment, and element inspector tools on a live webpage

Cost / License

Platforms

  • Online
  • Google Chrome
Real-time collaborative annotation with threaded comments
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MarkLayer information

  • Developed by

    Vadym Rusin

  • Licensing

    Open Source (Apache-2.0) and Free product.

  • Written in

  • Alternatives

    5 alternatives listed

  • Supported Languages

    • English

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Web Browsers

GitHub repository

  •  5 Stars
  •  1 Forks
  •  1 Open Issues
  •   Updated  
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What is MarkLayer?

MarkLayer is a free, open-source web annotation tool. Draw, highlight text, and pin threaded comments directly on any live webpage, then share a single link so anyone can see your annotations in real time (live cursors, synced drawings, voice/video chat via WebRTC). No accounts, no sign-up, no email required. Available as a web app (paste any URL) and as a Chrome extension for sites the web app cannot embed. Includes an element inspector that captures CSS selectors and AI-ready context, plus an MCP server (marklayer-mcp) so AI coding agents like Claude Code can resolve annotations as a work queue. Self-hostable on Cloudflare Workers. Annotations auto-expire after 90 days of inactivity.

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