Glasp Web Highlighter Chrome Extension
Highlights text on any page, PDF or YouTube video, then syncs it to one place.
At a glance
Starts at
Free
Listed as free on the Chrome Web Store.
Free tier
Yes
Platforms
Chrome
Best for
Readers building a searchable library of saved quotes
Not for
Anyone wanting to keep highlights entirely private by default
4.5 out of 5
Scored by Alex after real useOur verdict
Glasp lets you highlight text on any website, inside a PDF, or over a YouTube video, in a choice of colors, then pulls everything into one searchable homepage you can tag and link to. AI models including ChatGPT, Claude, Mistral and Gemini can summarize what you've collected, and Kindle highlights sync in too. It's built around a social layer as much as personal storage, with public curators to follow and collections you can share on Twitter, Teams or Slack, so it's less suited to someone who wants highlights kept strictly private.
✓What it does well
Highlights everywhereYou can highlight websites, PDFs, images and YouTube videos alike.
AI-powered summariesSummaries of what you've annotated are generated using several AI models.
Cross-device accessSaved highlights sync and appear across all your devices.
✕Where it falls short
Built for public sharingThe platform leans toward public curators and shared collections, not a purely private notebook.
Depends on third-party AISummaries depend on external AI models like ChatGPT, Claude or Gemini.
Chrome onlyIt's only available as a Chrome extension, not other browsers.
Key features
Multi-color highlightingHighlights can be marked in several different colors for organizing.
YouTube and PDF supportHighlighting and annotation work on YouTube videos and PDF files too.
AI annotation summariesYour highlights and notes can be summarized using AI models.
Kindle highlight syncHighlights from Kindle eBooks sync in alongside your web highlights.