PDFAITools
Glasp
Annotate, collect and share web highlights socially — build a second brain from your reading.
What is Glasp?
What is Glasp?
Glasp is a social web highlighter and knowledge-building tool that allows users to annotate text and images on any website, then automatically organizes those highlights into a personal knowledge library. Unlike private note-taking apps, Glasp introduces a social layer — your highlights and annotations can be shared with a community of learners, making knowledge discovery a collaborative experience.
Building a Second Brain
Glasp positions itself as a tool for building a "second brain" — a curated, searchable repository of everything you've read and found valuable across the web. Highlights sync across devices and can be exported to note-taking apps like Roam Research, Obsidian, and Notion, making it an excellent complement to existing PKM (personal knowledge management) workflows.
- Browser extension for one-click highlighting on any webpage
- Social feed showing highlights from people you follow
- AI-powered summary generation from your highlights
- Export to Roam, Obsidian, Notion, and plain text formats
- YouTube transcript highlighting support
Who Is Glasp For?
Glasp is beloved by researchers, writers, students, and knowledge workers who consume a large amount of online content and want a systematic way to capture and revisit insights. The social discovery aspect also makes it a great tool for finding like-minded readers and thinkers.
Key Features
Highlight text and images on any website with a browser extension and add personal notes to each selection.
All highlights are automatically organized into a searchable personal library, accessible anytime.
Follow other readers and discover valuable content through their public highlight feeds.
Generate AI-powered summaries from your collected highlights to quickly revisit key ideas.
Export highlights seamlessly to Roam Research, Obsidian, Notion, and other knowledge management tools.
Who Uses Glasp?
Collect and annotate sources while reading research papers and articles across the web.
Build a rich reference library of quotes and ideas to draw from when writing articles or books.
Capture key lessons from online reading and revisit them in an organized, searchable format.
Pros & Cons
✅ Pros
- Free to use with a generous feature set
- Social discovery layer is unique among highlighting tools
- Strong integrations with popular PKM tools
- YouTube transcript highlighting is a standout feature
❌ Cons
- Requires a browser extension — not a standalone web app
- Social features may not appeal to users who prefer private workflows
- Mobile support is limited compared to desktop
Glasp Pricing
Free
- Unlimited highlights
- Social feed
- PKM exports
- YouTube highlighting
- AI summaries
Glasp earns a 4.2/5 rating from our editorial team. It's completely free to use with no hidden costs, making it one of the most accessible tools in the AI Tools space. Standout strengths include free to use with a generous feature set and social discovery layer is unique among highlighting tools.