Glasp

Overview

Glasp is a free, social web and PDF highlighter designed for researchers, students, and lifelong learners. It lets you highlight text on web pages, PDFs, YouTube videos, and even Kindle books, capturing ideas in a single, searchable library. Unlike traditional highlighting tools, Glasp is built to be social and AI-native: your highlights can be shared without requiring a login, and they feed a personal AI assistant that helps you summarize, reflect, and recall knowledge. With browser extensions for Chrome, Safari, Edge, and Firefox, plus dedicated iOS and Android apps, Glasp works across the platforms where you read and learn.

At the core of Glasp is an AI learning memory. Every highlight you make becomes part of a personal knowledge base that an AI can query. You can chat with your highlights, ask questions grounded in your own saved content, generate one-click AI summaries of articles, PDFs, and YouTube videos, or resurface a half-remembered idea by describing it. The MCP connector extends this capability to external AI tools such as Claude and ChatGPT, letting them answer using the content you have collected. Importers support Kindle, Pocket, Readwise, Raindrop, Instapaper, Matter, Medium, Snipd, Hypothesis, Weava, Diigo, and Wallabag, while exporters seamlessly send highlights to Notion, Obsidian, Roam, Tana, Workflowy, Zotero, or to Markdown, HTML, CSV, and JSON files.

Glasp also emphasizes organization and social discovery. Highlighted passages and notes can be tagged, sorted by author, and searched in seconds. A knowledge graph maps what you read and enables you to follow people who highlight topics you care about, turning personal reading into a shared learning experience. The platform includes a curated discovery section with ideas, articles, book recommendations, quotes, and video summaries. For users who prefer anonymity, Glasp Pro provides unlimited private highlights, while the free tier remains fully functional for public highlighting and core features.

The tool is particularly valuable for evidence gathering, note-taking, and writing workflows. Researchers can collect evidence across papers and the web and query their own library instead of rereading everything. Students can turn lectures, PDFs, and YouTube videos into reviewable notes. Writers and creators can build a swipe file of quotes and ideas and pull them into their note-taking apps. With its rebuilt 2026 mobile application, Glasp brings this experience to iOS and Android with a native Reader, YouTube summaries, and home-screen widgets. Developers can also use the Glasp API to integrate highlights into custom workflows.

Core capabilities

Web & PDF Highlighter

Highlight text directly on any webpage or PDF in Chrome, Safari, Edge, or Firefox, with the ability to add notes and sync across devices.

YouTube Video Summarizer

Generate AI summaries and transcripts of YouTube videos, and highlight moments with timestamps.

AI Memory & Chat

Chat with your highlights, ask questions grounded in your saved content, and get one-click AI summaries of articles, PDFs, and videos.

Chat with PDF

Ask any PDF questions with AI, turning static documents into interactive learning resources.

MCP Connector

Connect Glasp highlights to Claude, ChatGPT, and other AI clients via the MCP protocol for context-aware answers.

Import & Export Integrations

Import from Kindle, Pocket, Readwise, Raindrop, Instapaper, Matter, Medium, Snipd, Hypothesis, Weava, Diigo, and Wallabag; export to Notion, Obsidian, Roam, Tana, Workflowy, Zotero, Markdown, HTML, CSV, or JSON.

Social Knowledge Graph

Discover public highlights, follow people with similar interests, and build a shared learning community.

Mobile Apps

Rebuilt iOS and Android apps with a native Reader, YouTube Summary, home-screen widgets, and a mobile Safari extension for highlighting on the go.

Browser Extensions

Available for Chrome, Safari, Edge, Firefox, and Opera, with dedicated mobile browser support.

Developer API

Access Glasp's API for developers to build custom workflows and integrate highlights into external applications.

Use cases

Conducting literature reviews and gathering evidence across papers and web pages.

Turning lectures, PDFs, and YouTube videos into structured study notes.

Keeping a swipe file of quotes and ideas for writing projects.

Building a shared learning community through public highlights and knowledge graphs.

Preparing for exams by reviewing tagged highlights with AI-generated summaries.

Integrating personal reading highlights into AI chat assistants like Claude and ChatGPT.

Migrating existing highlights from Kindle, Pocket, Instapaper, or Readwise into one unified library.