Meta Tag Analyzer

What the meta Tag Analyzer does

This analyser parses your page's HTML and reports on the tags that determine how search engines and social platforms understand it. It checks fourteen things: the title and meta description and their lengths, character encoding, viewport, canonical, robots directives, the lang attribute, the H1, the four core Open Graph tags, Twitter Card tags, and whether any meta name is declared more than once.

Duplicates are the failure worth understanding. Two title tags, two canonicals or two robots metas is not a case of the browser picking the first — search engines respond unpredictably, and with conflicting canonicals Google typically discards both and works it out itself. These duplicates usually arrive when a theme and a plugin both insert tags, which is exactly the kind of problem you cannot see by looking at the rendered page.

The check flagged most severely is a noindex robots meta on a page you intended to rank. It is a single word in a single tag and it removes the page from search entirely. It regularly survives a staging-to-production deploy, and it is a genuinely common cause of “my new site is not appearing in Google”.

Because parsing happens locally with the browser's DOMParser, the document produced is inert — scripts in the markup do not run and no external resources are fetched. You can paste the source of a client's site or a page behind a login without any of it leaving your machine.

How to use it

1. Open the page you want to check and view its source (Ctrl+U on Windows, ⌘+U on a Mac).
2. Select everything, copy it, and paste it into the box above.
3. Work through the findings — red items are problems, amber are worth considering, green are fine.
4. Fix the red items first, especially any noindex or duplicate canonical.

A worked example

A page that looks fine in a browser can report several problems at once:

✗ Meta description   Missing. Google will invent a snippet.
✗ Canonical          2 canonical tags — Google ignores all of them.
! Title tag          71 characters — likely to be truncated.
! Open Graph         Missing: og:image, og:url
✓ Viewport           Declared — the page can be mobile-friendly.

None of those are visible to a visitor and all of them affect how the page performs. The two canonicals in particular are a silent fault: the page appears to specify a canonical URL, so a casual check passes, but because there are two of them the instruction is discarded entirely and Google picks its own preferred URL.

Frequently asked questions