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Liner

AI Workspace

The AI Copilot for the web. Highlight text anywhere, organize your research, and get trusted answers backed by millions of user-curated highlights.

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About This Tool

Liner started as a simple web highlighter but has evolved into a powerful AI research workspace. Unlike generic AI chatbots, Liner’s “AI Search” prioritizes information that has been highlighted by real people, ensuring your answers come from credible, high-quality sources rather than SEO spam.

How to Use

  1. 1. Install the Liner browser extension (Chrome/Edge/Safari).
  2. 2. Highlight important text on any website or PDF.
  3. 3. Click the Liner icon to ask the AI to summarize or explain.
  4. 4. Use Liner Search to find answers with citations.
  5. 5. Organize your highlights into folders in your workspace.

Key Features

🖍️ Web Highlighter
🔍 Trusted AI Search
📺 YouTube Summary

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Additional Information

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Use Cases

Liner is popular among university students for thesis research, content creators for curating newsletters, and professionals who need to keep track of industry news without losing the source.

Liner Copilot

The Copilot sidebar lives in your browser. You can ask it to translate a paragraph, explain a complex technical term, or summarize a long YouTube video without ever leaving the page you are viewing.

Reliability

Liner reduces AI hallucinations by grounding its answers in “Trusted” sources—pages that have been highlighted and verified by millions of other Liner users—rather than just scraping the entire open web.

Limitations

The free version has limits on the number of AI queries per day and access to advanced models (like GPT-4). It requires a browser extension installation to function effectively on desktop.

Cross-Platform

Liner has excellent mobile apps (iOS/Android). Highlights made on your phone automatically sync to your desktop workspace, making it easy to research on the go and write later.