International SEO utility · CSV validation
Hreflang
validator.
Validate hreflang implementation data before deployment. Check BCP 47 language tags, duplicate annotations, self-references, missing target pages and reciprocal mappings.
Validate hreflang mapping data
Upload or paste a CSV containing each page's language and every hreflang annotation emitted by that page.
The CSV is read in your browser and is not transmitted.
Required columns:
page_url,page_language,hreflang,target_url. One row per hreflang annotation.| Row | Page | Language | Target | Findings |
|---|
This validator checks the supplied mapping dataset. It does not fetch live HTML, inspect HTTP response headers, or confirm that the annotations are actually present on the pages.