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Liner
AI research assistant that highlights, annotates, and synthesizes web content and PDFs
Visit Liner
https://getliner.com
About Liner
Liner is an AI-powered search and research assistant that highlights, annotates, and synthesizes information from web pages, PDFs, and YouTube videos. It layers AI on top of your browsing — you highlight text on any page, and Liner's AI explains, expands, or connects it to your other saved content. Used by over 10 million researchers, students, and knowledge workers for curating and understanding information.
Key Features
Liner Pros & Cons
✅ Pros
- +10M+ users makes it one of the most validated research tools available
- +Browser extension creates zero-friction highlighting workflow
- +YouTube summarization is particularly useful for researchers who prefer reading
- +Cross-platform search across all saved content is a major productivity win
⚠️ Cons
- −AI feature quality lags behind newer research tools like NotebookLM
- −Free tier AI limitations are quickly reached
- −Less powerful than Perplexity for initial research discovery
- −Annotation syncing can be slow on large document collections
Who Is Liner Best For?
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