Check with Lenz

Fact-check anything you read on the web. Select text, click the bookmarklet, and get a sourced verdict in seconds.

Drag this button to your bookmarks bar:

Click won't work — you need to drag it!

On mobile, bookmarklets need to be added manually. Create a new bookmark and paste this as the URL:

javascript:void(window.open('https://lenz.io/?claim='+encodeURIComponent((window.getSelection().toString().trim()||prompt('Enter a claim to check:')||'').substring(0,2000))))

How it works

Select any text on a webpage — a headline, a tweet, a comment, anything that sounds like a claim.

Click "Check with Lenz" in your bookmarks bar.

Get your verdict. Lenz opens with the claim pre-filled, ready to research and score it.

Works everywhere

Chrome, Firefox, Safari, Edge, Brave, Arc — any browser with a bookmarks bar.