Browser Extension
CheckSEO for your browser
Check any website’s SEO score in one click while you browse — no signup, free. Powered by the CheckSEO API.
Download the extension
Works on Chrome, Edge, Brave, Opera (and Firefox). Follow the steps below to install it in your browser.
Download Extension (.zip)One-click install via the Chrome Web Store is coming soon.
- Download & unzip the extension file above. Remember the folder where you unzipped it.
- Open your browser and go to
chrome://extensions(Edge:edge://extensions, Brave:brave://extensions). Paste it in the address bar and press Enter. - Turn on Developer mode — the toggle is in the top-right corner.
- Click Load unpacked (top-left), then select the unzipped folder (the one containing
manifest.json). - The CheckSEO icon appears in your toolbar. Click the puzzle-piece icon and pin it for quick access.
- Done! Visit any website, click the CheckSEO icon, and get its SEO score instantly.
- Download & unzip the extension file above.
- Go to
about:debuggingin Firefox. - Click This Firefox in the left sidebar.
- Click Load Temporary Add-on… and select the
manifest.jsonfile inside the unzipped folder. - The CheckSEO icon appears in your toolbar — click it on any website to get the score.
On Firefox, temporary add-ons are removed when you restart the browser. A permanent Firefox Add-ons listing is coming soon.
What you get
- ✓ One-click SEO score & trust score for the page you’re viewing
- ✓ Top passed and to-fix checks at a glance
- ✓ A link to the full report with fixes on CheckSEO
- ✓ Free & private — scans the page’s public URL only. How we handle data.
Power users: the extension is built on our Developer API. Want higher limits or to build your own tools? Get an API key.