Add Extension

Start annotating with a free personal account.

Use the Hypothesis browser extension to annotate anything, anywhere. Follow these two simple steps to get started.

Sign up for a free account.

Hypothesis is always free for personal use and collaboration. For our premium Education and Enterprise solutions, talk to our sales team.

Create Account

Add Hypothesis to your browser.

Install the Hypothesis Chrome extension from the Chrome Web Store. The extension also works on other Chromium-based browsers, including Brave, Vivaldi, and Microsoft Edge.


For Chrome
Click the button below to install the Hypothesis extension from the Chrome Web Store.

Add Extension

For Firefox or Safari
Drag this button to the bookmarks bar, or right-click/control-click to bookmark the link.

Hypothesis Bookmarklet

How to make annotations.

Go to any page or document in your browser with the Hypothesis extension turned on. Select the content you want to annotate, and a window will open on the right side of the browser. You can also view and respond to other public or group annotations.

View our Annotation Basics for tips on using Hypothesis.

Annotation Basics