Canonical Tag Checker
Paste a page's HTML and instantly see its canonical tag, title, meta description, H1 and Open Graph tags.
Paste your page HTML and check the canonical URL, title, meta description and more — no login needed.
Paste your page HTML (View source → copy).
Run this tool
Free daily runs · Pro is unlimited.
How to use Canonical Tag Checker
- Paste your page HTML.
- Review the extracted SEO tags.
- Fix any missing or mismatched canonical.
Frequently asked questions
Why canonical matters?
It tells search engines which URL is the preferred version, preventing duplicate-content issues.
Should it be absolute?
Yes, canonicals should be full absolute URLs.
Is it free?
Yes, free with no signup.
Automate this at scale
MarsGeo Pro adds bulk audit, programmatic SEO page generation and API access.
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