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Canonical Tag Checker.

HTML, text, URLs and results remain in this browser. Parse canonical declarations and compare normalized source and target URLs. Uses passive local parsing and independent verification.

Use Canonical Tag Checker

Private in this browser. Pasted data stays in this browser; the tool does not request remote sites.

Tool options
Preparing the local tool…

How it works

  1. 01

    Paste data and choose the explicit rules.

  2. 02

    Run the bounded local analysis.

  3. 03

    Review limitations before downloading the verified result.

Frequently asked questions

Does the tool validate a live site?

No. It analyzes only pasted data and does not promise search-engine behavior.

Does Canonical Tag Checker upload my data?

Canonical Tag Checker runs locally in your browser. Pasted data stays in this browser; the tool does not request remote sites.

What output does Canonical Tag Checker create?

Canonical Tag Checker creates Json output after the result passes its local verification checks.

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