OpenCapture › Chrome screenshot extension
OpenCapture is a free, open-source Chrome screenshot extension. Click its icon to capture the full page, the visible area or a region you drag, then crop, annotate and blur the image and export it as a PNG or PDF. All of it runs inside Chrome: nothing is uploaded, and no account is needed.
A screenshot extension sees whatever is on the page you capture: account numbers, internal dashboards, private messages. Four questions tell you most of what you need to know about one, and here are OpenCapture’s answers.
OpenCapture asks for four permissions and no others: activeTab, to capture the tab whose icon you clicked, only after you click it; scripting, to run the capture script in that tab at that moment; downloads, to save the file; and storage, for your preferences and the local history. It requests no host permissions at install and has no content script that runs on every page, so it cannot read a page you did not click it on. What each permission means, in any extension, is in screenshot extension permissions, explained.
Nowhere. Capturing, stitching, editing and exporting happen in the browser, in a Rust/WebAssembly core. There is no cloud library and no sync. How that can be checked is on nothing is uploaded.
Everything except one tool. All three capture modes, crop, annotation, blur, undo and PNG/PDF export are free with no account. The one paid tool is the tiled watermark, a one-time US$5 Supporter unlock. There is no subscription.
Yes. The extension is open source under AGPL-3.0-or-later, and the source is on GitHub. The permissions above are in its manifest, where anyone can check them.
Chrome has no screenshot command in its menus. The closest it gets is Capture full size screenshot inside DevTools, which downloads a PNG of the whole page with no preview and no editing step. The steps, and the four places it stops, are in how to take a full page screenshot in Chrome. If that PNG is all you need, you do not need a Chrome screenshot extension.
OpenCapture is built from one source tree for Chrome, Edge and Firefox, and works the same way in all three. In Chrome it needs version 116 or later. Firefox also has a capable tool of its own, covered in full page screenshot in Firefox. How OpenCapture compares with other screenshot extensions is on alternatives.
Yes. OpenCapture is free and needs no account for full page, visible-area and selected-area capture, crop, annotation, blur, undo and PNG or PDF export. Only the tiled watermark is paid, as a one-time US$5 unlock.
No. Every capture is stitched, edited and exported inside your browser. The extension has no cloud library and no sync, and the extension itself collects no analytics.
Four: activeTab, scripting, downloads and storage. It requests no host permissions at install and has no content script running on every page, so it only reaches the tab whose icon you click.
Yes. OpenCapture is published on Microsoft Edge Add-ons and Firefox Add-ons as well as the Chrome Web Store, built from the same source, with the same tools in each.