CANONICAL TAG & DUPLICATE AUDITOR v7.0

Free Canonical Tag Checker

Inspect webpage HTML to locate, validate, and analyze the Canonical link tag. Ensure search engines understand the master version of your pages to prevent duplicate content penalties.

Deep DOM Parsing
Smart URL Normalization
Multiple Tag Detection
Actionable SEO Guidance
  • {{ step.title }}

Analysis Failed

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Canonical Status
{{ status === 'Found' ? t('seo.canonicalChecker.found', 'Found') : (status === 'Missing' ? t('seo.canonicalChecker.missing', 'Missing') : status) }}
Tag Relation
{{ relation === 'Self-Referencing' ? t('seo.canonicalChecker.selfRef', 'Self-Referencing') : (relation === 'External / Different Page' ? t('seo.canonicalChecker.pointsExternal', 'Points External') : relation) }}
URL Format
{{ format }}
Multiple Tags
{{ multiple === 'Yes' ? t('seo.canonicalChecker.yes', 'Yes') : (multiple === 'No' ? t('seo.canonicalChecker.no', 'No') : multiple) }}

Canonical URL Comparison

Requested Page URL
{{ reqUrlDisplay }}
Canonical Target URL
{{ canUrlRaw }}
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{{ assessment.title }}

{{ assessment.desc }}

Extracted HTML Tag

{{ rawHtml }}

Recent Audits

{{ item.status === 'Found' ? t('seo.canonicalChecker.found', 'Found') : (item.status === 'Missing' ? t('seo.canonicalChecker.missing', 'Missing') : item.status) }} {{ item.url }}
{{ item.relation === 'Self-Referencing' ? t('seo.canonicalChecker.selfRef', 'Self-Referencing') : (item.relation === 'External / Different Page' ? t('seo.canonicalChecker.pointsExternal', 'Points External') : item.relation) }} • {{ item.date }}

Deep DOM Parsing

Securely fetches the raw HTML via a backend proxy to bypass CORS, then precisely extracts the <link rel="canonical"> tag.

Smart Comparison

Compares the requested URL against the extracted canonical link, normalizing trailing slashes to accurately determine relationships.

Multiple Tag Detection

Search engines ignore canonicals if there are multiple competing tags. This tool instantly flags if more than one tag is present.

Absolute vs Relative

Validates if the canonical URL is an absolute path (Best Practice) or a relative path, warning you if adjustments are needed.

Actionable SEO Advice

Generates a clear SEO assessment based on the specific scenario (Self-referencing, External, Missing, or Erroneous).

Code Verification

Displays the exact raw HTML snippet found in the document head so developers can verify the code implementation directly.

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Tool Title

Tool Description

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