SEO Signal Check

The page’s SEO details.
One click away.

Titles, descriptions, headings, images, links and social tags in a compact inspector. Open a page, click the extension, and see what’s actually there.

Download Chrome extensionTry the interactive sample
Free · No account · No API fees · Desktop Chrome 116+

Initial unpacked release. Not yet listed in the Chrome Web Store.

Six tabs. The details you need.

Summary
Title and description lengths, canonicals, robots directives, language, all meta tags, hreflang and JSON-LD.
Headers
H1 through H6 in document order, with a copyable outline.
Images
Image URLs, missing and empty ALT attributes, dimensions and loading hints.
Links
Internal and external destinations, anchor text, rel attributes and unique-link counts.
Social
Open Graph and Twitter / X card metadata, without loading remote images.
Tools
Shortcuts to PageSpeed Insights, Rich Results Test, validators, robots.txt and sitemap.xml.

Install in desktop Chrome

  1. Download and unzip the extension.
  2. Open Chrome’s Extensions page and enable Developer mode.
  3. Select Load unpacked and choose the unzipped folder containing manifest.json.
  4. Pin SEO Signal Check, open a website, then click its icon.

Updates: replace the files in the same folder, then click Reload on its extension card. Mobile Chrome does not run extensions; the sample works on mobile.

Your browser does the inspection.

The extension reads the current page only when you open it. It has no all-sites permission, background crawl or audit upload. Export CSV or JSON to keep your results. External testing tools receive the page URL only when you choose to open them.

It inspects the rendered page, not server headers or search-engine indexing. Missing data is shown plainly; character counts are measurements, not promises of how Google will display a snippet.

Privacy and limitations

Auditing a Google Business Profile? Use GBP Signal Check.