ToolBirch

Canonical URL Checker

Read a page canonical, robots and title tags from its HTML.Web & SEO Tools

Canonical URL Checker

Paste a page's HTML and read back its canonical link, robots meta and title tags. Nothing is fetched — this reads only what you paste.

About this tool

Paste a page HTML source and see its canonical link, robots meta, title length and Open Graph basics — with warnings for missing canonicals, over-long titles and duplicate description tags.

How to use the Canonical URL Checker tool

  1. Paste the HTML. View-source, copy, paste.
  2. Check. The head tags are parsed and reported.
  3. Act on the tips. Each warning suggests the fix.

Supported formats

Input

  • Plain text or file input

Output

  • Converted or analysed output

Inputs are validated before anything is processed. Invalid values and unsupported files are rejected with a clear error instead of failing silently.

Frequently asked questions

Why paste instead of fetching a URL?

Reading the served source is more reliable than a server-side fetch, and nothing leaves your browser.

What title length is ideal?

Roughly under 60 characters to avoid truncation in results.

Are multiple canonicals a problem?

Yes — contradictory canonicals are worse than none; the checker flags them.

Privacy

Everything you enter stays in this browser tab. There is no upload endpoint for tool inputs, no account, and no server-side copy of your text or files. Results are produced locally and disappear when you close the page.

No account is required and no file is ever uploaded. See the privacy policy for details about analytics and the limited data this site stores.

Known limitations

  • Script-inserted tags are invisible: paste the served HTML, not the live DOM.

Related tools

Other free tools from the same collection.

Meta Tag GeneratorGenerate complete head meta markup from your page values.Open Graph GeneratorGenerate og: and twitter: card markup for rich previews.Robots.txt GeneratorBuild a robots.txt from your crawl rules.Sitemap ValidatorValidate sitemap XML structure, URLs and dates locally.