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Canonical URL Checker

Paste your page's HTML source code to extract, validate, and diagnose canonical tag issues that affect SEO.

HTML Source

If provided, the canonical URL will be compared against this page URL.

How It Works

This tool parses your HTML source code to find <link rel="canonical"> tags, then runs a comprehensive set of validation checks against SEO best practices.

What Gets Checked
  • Tag presence — Verifies a canonical tag exists in the <head>
  • Duplicate tags — Detects multiple conflicting canonical declarations
  • Absolute URL — Ensures the href is a fully-qualified URL, not relative
  • Protocol — Checks for HTTPS usage and protocol consistency
  • Trailing slashes — Flags inconsistent trailing slash usage
  • Query parameters — Warns about URL parameters in canonical URLs
Why Canonical Tags Matter
  • Duplicate content — Tells search engines which URL is the preferred version
  • Link equity — Consolidates ranking signals to a single URL
  • Crawl budget — Helps search engines avoid crawling duplicate pages
  • Cross-domain — Can point to content on a different domain for syndication
Best Practices:
  • Every page should have exactly one self-referencing canonical tag
  • Always use absolute URLs with HTTPS
  • Place the canonical tag in the <head> section, not <body>
  • Avoid canonical tags pointing to redirecting or non-200 URLs
  • Keep canonical URLs clean — remove unnecessary query parameters and fragments

Related Utils

Meta Tag Extractor Meta Tag Generator Redirect Checker Heading Analyzer Open Graph Preview

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