Free meta tag checker

How to read a meta tag check

A meta tag checker reads the head of a page and reports whether the fields search engines and social apps look at are present, and whether the title and description are a useful length. You paste the head, or only the tags. The check runs in this browser with DOMParser. The HTML is not uploaded and is not stored.

The title element is the blue link in a search result and the name on a browser tab. A useful title names the product and the job it does. About 30 to 60 characters is long enough to be specific and short enough that the link is less likely to be cut off on a phone. Use one title element. When the HTML contains two, browsers and crawlers usually keep the first.

The meta description is the gray snippet under that link when a search engine chooses to use it. Search engines rewrite snippets, so the description is a suggestion, not a promise. About 120 to 160 characters can say what the tool is, who it is for, and why the page is worth opening.

A canonical link tells crawlers which URL is the preferred copy of the page. If you include one, use an absolute https URL with the scheme and the host. A relative path such as /tool is easy to misread when the page is previewed or shared from another host. This checker warns when the tag is missing and fails when a canonical is present but is not absolute https. Keep a single canonical.

The robots meta tag is how a page asks to be left out of an index. noindex means you do not want that URL in search results. This checker fails when noindex is present, including the shorthand none, which means noindex and nofollow together. It also reads googlebot and bingbot meta tags, because a page can say index in the generic robots tag and noindex for one crawler. Pasted HTML cannot show an X-Robots-Tag header. If a host or CDN sets that header, check the live response separately.

The viewport meta tag tells mobile browsers how to scale the layout. A missing viewport is a common reason a launch page looks like a shrunken desktop site on a phone. The usual value is width=device-width, initial-scale=1. This checker fails a missing viewport and warns when a viewport tag does not set the device width.

Open Graph tags are the title, description, and image that chat apps and social sites read when someone pastes your URL. Put og:title, og:description, and og:image in the head if you care how a shared link looks. This tool only checks that those three tags are present. It does not download og:image, so a tag can still point at a broken file or a picture that is too small. After the row passes, open the image address yourself.

Before you submit a tool, check the public page, not a local draft. View the source, copy the head, and paste it here. Fix failures first: a missing title, a missing description, a canonical that is not https, a noindex you did not mean to ship, and a missing viewport. Then fix warnings: length, a missing canonical, and missing Open Graph tags. If you are cleaning a signup list, use the disposable email checker as well. When the page is in good shape, list the product on Uno Directory.