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Canonical checker
Enter a URL. The tool reads its canonical tag, checks the value is absolute, and tests whether the target actually returns 200.
The three ways canonicals fail
- Missing: the page leaves the choice to signals you do not control.
- Relative or malformed: the tag is ignored.
- Target broken: pointing at a 404 or redirect means the canonical target cannot be indexed.
The checker runs all three checks in one pass and shows the verdict.