Canonical Tag Checker
The canonical tag tells search engines which address is the main version of a page. The tool reads it and shows whether it is present, valid and pointing to the page itself or elsewhere.
Checked by our server, free and without an account
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What the tool looks at
- Presence and number of canonical links.
- The target URL and whether it matches the checked page.
How it works
- Enter the address. Only public web addresses on the standard ports are accepted.
- Our server fetches what the check needs once, with its own honest bot name, and evaluates it.
- You get the evaluated values with a short explanation. Nothing from the page is stored.
More On-page SEO tools
All tools- Title Tag CheckerCheck the title tag of any page – is it there, is it unique on the page and is its length right for search results?
- Meta Description CheckerCheck the meta description of a page – present, unique and of a length that fits search results.
- Meta Tags CheckerSee every meta tag of a web page in one list – name, property and content, evaluated and ready to compare.
- Heading Structure CheckerCheck the H1 and the heading structure of a page – one clear main heading and a logical order of H2 to H6.
- Noindex CheckerFind out whether a page may appear in search results – meta robots, X-Robots-Tag header and robots.txt in one check.
- Robots.txt CheckerCheck the robots.txt of a website – is it reachable, which rules does it contain and does it block the page you entered?
- XML Sitemap CheckerCheck an XML sitemap – reachable, well-formed, how many URLs it lists and whether it is a sitemap index.
- Schema Markup CheckerFind the structured data of a page – JSON-LD, microdata and the schema.org types it declares.
- Open Graph CheckerCheck the Open Graph tags of a page – title, description, image and URL used when the page is shared.
- Image Alt Text CheckerFind images without alt text on a page – important for accessibility and for image search.
- SEO-Friendly URL CheckerCheck whether a URL is easy to read and share – length, characters, parameters and word separators.
- 404 Page CheckerCheck whether a site answers missing pages with a real 404 status instead of a soft 404 or a redirect.
- Language Attribute CheckerCheck the lang attribute of a page – set on the html element and a valid language code?
- Favicon CheckerCheck whether a website has a favicon – declared in the HTML or at the default location, and reachable.
- Social Links CheckerFind the links to social network profiles on a page – which networks are linked and where they point.
The whole page in one audit
One audit runs more than 50 tests, rates them by severity and turns them into a score. Websites are re-checked on a schedule.