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Polar Bookshelf

Polar Bookshelf

Polar is a personal knowledge repository for PDF and web content supporting incremental reading and document annotation.

Polar Bookshelf



Polar is personal knowledge repository which supports advanced features like incremental reading, annotation, comments, and spaced repetition. It supports reading PDF, EPUB, and the web content.

Features

  • PDF support We have first-class PDF support thanks to PDF.js. PDFs work well when reading content in book format or when reading scientific research which is often stored as PDF.

  • EPUB support Add any EPUB and we also capture web content to EPUB/

  • Captured Web Pages Download HTML content and save them as offline documents which can be annotated.

  • Pagemarks Easily keep track of what you're reading and the progress of each document.

  • Text Highlights Highlight text in PDF and web pages.

  • Area Highlights Capture a region of the page as a highlight which can be a chart, figure, infographic, etc.

  • Portable Run across any platform. Linux, MacOS, and Windows supported.

Downloads

Packages for Windows, MacOS, and Linux are available on the downloads page.

We also have a CHANGELOG available if you're interested into what went into each release.

Discussion

We have both a Discord group and Reddit group if you want to discuss Polar.

If it's a very technical issue it might be best to create a Github Issue.

Contributors

This project exists thanks to all the people who contribute.

Sponsors

Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [Become a sponsor]

License

Polar is distributed under the GPLv3.

PDF.js is available under the Apache License. Electron is released under the MIT License. Rest of the code is MIT-licensed.

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Something missing? Edit this app.

Keyboard Shortcuts

Key Action
/ Focus the search bar
Esc Focus the search bar and cleans it
Select the next search result
Select the previous search result
Enter Open the selected search result
cmdEnter Ctrl+Enter Open the selected search result in a new tab