Web Page Capture and Archival of HTML Content

Polar supports long term web page archival via a process called “capture” which downloads and caches the content locally. We store it in Polar as if it were any other type of document (like PDF).

This allows you to manage web pages with tags and annotations including text and area highlights, comments, and flashcards.

This essentially allows Polar to work like your own personal Internet archive for documents critical to your education and maintain the knowledge contained within using annotations and comments and use incremental reading to read large collections of web pages in parallel.

One issue with annotating documents on the web is that the author might change the document (or even delete it) thereby invalidating your annotations.

Polar prevents that by capturing the content on disk (and in the cloud) for your own long term usage.

During this process we fetch the full HTML, including iframes, and store them in a portable PHZ file that can be used for long term archival of web content.

Additionally, we capture the document in a way to make them more usable and more readable.


Polar supports capturing the document in a more readable form by emulating tablet and mobile devices during capture.

Websites usually try to cooperate with tablets and mobile devices by making them more readable on smaller screens.

With Polar we emulate these devices during capture to preserve web pages in a more readable form - often with sidebar and navigational content removed.

Document Captured with Sidebar

Captured as Tablet with Sidebar Removed

Capture prevents the problem of “link rot” where URLs vanish from the web over time due to a natural form of attribution. Either the domain expires or the content is deleted or the location changed.

The Internet Archive has found that more than 9M URLs on Wikipedia return 404 error pages.

With Polar you never have to worry about this being an issue as you have a permanent long term copy of important content.


To capture a new page just select File | Capture Web Page then enter a URL.

A preview window will show what the page will look like in Polar.

After that you have to click the ‘capture’ button to the top right and a new document will be saved within Polar.

Document Repository

After the web page is captured and saved locally it’s saved to the document repository where you can reference it at any time in the future.

The document repository supports features like tagging, tracking reading progress, custom sorting (by updated time, added time), etc.

Chrome Extension

The Polar Chrome Extension allows you to send directly from Chrome into Polar. You can copy the URL and paste it into Polar directly but it’s more convenient to have a one click button in integrated into your browser.