Glasp
Glasp is a web and PDF highlighting tool for researchers and learners. You can highlight any web pages and documents for free, use AI to summarize YouTube videos, and turn your highlights into a conversational personal knowledge base.
Updated: 2026-10-26
What is Glasp?
Glasp is a social web and PDF highlighting tool for researchers and learners. Its official positioning is "Highlight the Web & build your AI memory", which means annotating web content and turning it into AI memory that thinks with you. It is free to use for highlighting key points and taking notes on any web pages, PDFs, YouTube videos, and Kindle books, and then aggregates all annotations into a library that can be searched by tags and authors. According to the official website, more than 2 million researchers and lifelong learners are already using it, and it offers extensions for Chrome, Safari, Edge, Firefox, as well as mobile apps for iOS and Android.
Who is it for?
- Graduate students and researchers conducting literature and material surveys who need to gather key points from various web pages and PDFs
- Students who are used to reading long texts, watching academic videos and taking notes, and who hope that their notes can be retrieved and reused
- Writers and content creators who need to refine the materials they have collected into a conversable resource library
- Lifelong learners who want to turn daily reading into personal knowledge assets for continuous accumulation
- People who use Kindle and multiple note-taking apps and want to connect their highlights across platforms
Key features
6Highlight on Any Page and PDF
Select text directly on web pages, PDFs, YouTube videos or Kindle books to add highlights and notes, and jot down ideas on the spot when inspiration strikes.
Video Segment Highlighting
Clip and annotate YouTube videos by timestamps, transforming key viewpoints in long videos into reviewable structured segments.
AI Review & Dialogue
Have conversations with your highlights using AI, generate summaries, and query your own memory, turning scattered annotations into retrievable knowledge.
Kindle Import
Bring your Kindle reading notes into Glasp to centrally manage and search annotations from different sources.
Tags, Search & Reuse
All highlights are categorized by tags and authors, searchable in seconds, and can be sent to note-taking apps for further in-depth processing.
Integrated with ChatGPT and Claude
Your highlights can be connected to conversational tools such as ChatGPT and Claude, allowing you to access your personal knowledge base in external workflows.
How to use Glasp
- It is recommended to start annotating from daily reading instead of waiting until you need to write something to go back and look: Highlight casually on web pages and PDFs, and Glasp will automatically file them away.
- You can directly search and call them up when writing.
- When watching long videos, make good use of timestamp annotations, which make it easier to review key points than bookmarking the entire segment.
- During the organization phase, use tags to categorize annotations by theme, and then use AI conversations to generate summaries and ask follow-up questions, which is much more efficient than simply hoarding bookmarks.
- The free version already covers core annotation and synchronization capabilities.
- the specific scope of cross-application sending and AI functions is subject to the on-page instructions on the official website.
- When importing others' copyrighted content for annotation, pay attention to the boundaries between personal use and external sharing.
Traffic & popularity
Data month Sep 2026
Glasp receives about 2.4M visits per month and ranks #17,787 worldwide.
Monthly visits
12 monthsTraffic sources
- Direct44.5%
- Social23.3%
- Search10.8%
- Display ads6.6%
- Referrals6.6%
- Other8.3%
Top countries
- United States16.4%
- South Korea10.0%
- India9.4%
- Brazil5.5%
- Japan4.4%
Estimated from third-party traffic data.
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