MarkLayer
Annotate any webpage — now with an MCP server for AI agents
What it does
Free, open-source web annotation tool. Draw, highlight, and pin threaded comments on any live webpage, then share one link for real-time collaboration (live cursors, voice/video). New since launch: an element inspector for AI-ready handoff, a measure tool, and an MCP server so agents like Claude Code can resolve your annotations as a work queue. No accounts, ever.
Free web app for annotating any live webpage. Paste a URL, draw and comment on the page, then share a link. No account, no email, no install. Open source.
Send your client one link. They comment straight on the live page in their own browser, without signing up or installing anything. MarkLayer is a free web app and Chrome extension for annotating any live webpage. Paste any URL on marklayer.app to draw and comment in your browser. No install required. Or use the free Chrome extension for in-place annotation on sites behind a login or with strict embed policies. Share a single link. Viewers need no extension or account. You never create an account or pay for a plan. Annotations are cleaned up 90 days after their last activity, and any comment or view resets that clock. Or add the free Chrome extension for sites the web app cannot embed. Most…from marklayer.app
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