Check a page’s on-page SEO
Paste the page source and get a SERP preview plus twenty checks, each explained in a sentence rather than scored out of a hundred. It measures title and description in pixels, which is how Google actually truncates them.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Open the page you want to check, press Ctrl+U to view the source, select all and copy.
- Paste it here (or drop a saved .html file).
- Read the preview and the checks; download the report if you need to send it on.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see are the tool’s own code and, once cached, none at all.
Frequently asked questions
Why can’t I just enter a URL?
Because a browser is forbidden from reading another site’s HTML — the same-origin policy exists precisely to stop that. Every “enter your URL” checker gets around it by fetching the page from their own server, which means your URL, your IP and the page contents pass through a third party. Pasting the source keeps that from happening.
Why measure pixels instead of counting characters?
Because Google truncates on width, not length. Sixty narrow letters fit where sixty wide ones do not, and thirty Japanese characters are wider than either. Character counters give confident, wrong advice; this one shows the pixel width against the limit.
Does anything leave my browser?
No. There is no server behind this page doing the work and no API being called — the whole tool is JavaScript running in the tab. Load it once and it keeps working with the connection off.