What is an hreflang return tag error and why is it critical?

Google requires bidirectional confirmation: if Page A links to Page B as its French alternate, Page B must also link back to Page A. Missing return links cause search engines to ignore international annotations entirely.

Does this tool validate ISO language and country codes?

Yes. It validates language codes against ISO 639-1 (e.g., en, es, de) and optional regional country codes against ISO 3166-1 Alpha-2 (e.g., en-US, en-GB, fr-CA).

Can I audit hreflang tags implemented in XML Sitemaps or HTTP headers?

Yes. The validator supports HTML link rel=alternate tags, XML Sitemap international extensions, and HTTP Link response headers.

What does x-default mean in hreflang annotations?

The x-default annotation indicates the fallback landing page for international users whose language or geographic region is not explicitly targeted by any alternate tag.

Free Online Hreflang Tag Validator & International SEO Audit Tool

Input

Single

Bulk

HTML

Sitemap

Page URL

Requires fetching (Subject to CORS).

URL List (One per line)

Checks structural validity.

Paste HTML Source

Upload XML Sitemap

Max 5MB. Client-side parsing.

Analysis Results 0 Tags

Enter data and click Validate to see results.

Visual Graph

Legend:
● Valid ● Error ● Warning

How to Master Hreflang Validation

Ensuring your international SEO strategy is sound starts with correct hreflang implementation. This tool helps you visualize and verify your tags instantly.

Validation Checklist

Self-Referencing: Every page must have a self-referencing hreflang tag.
Reciprocal Links: If Page A points to Page B, Page B must point back to Page A.
ISO Codes: Use correct ISO 639-1 format for languages (e.g., 'en', 'es') and optional ISO 3166-1 for regions (e.g., 'US', 'GB').
Absolute URLs: Always use full URLs including https://.

About Advanced Hreflang Tag Validator (Single & Bulk)

Ensure correct search engine targeting across global multilingual websites with the Free Online Hreflang Tag Validator & International SEO Suite by VibeTool. Automatically verify return tags, confirm valid ISO language codes, and diagnose international indexing errors across single URLs or bulk site clusters.

Hreflang Validator Features

Bidirectional Return Link Verification: Confirms that every language alternate properly points back to reciprocal source pages.
ISO 639-1 & ISO 3166-1 Code Auditing: Flags invalid language and regional country code combinations (e.g., uk vs gb).
x-default Fallback Inspection: Ensures default landing page directives are properly assigned for untargeted visitors.
Bulk Domain Cluster Support: Test entire localized domain ecosystems (.com, .de, .fr, .es) simultaneously.
Comprehensive Export Reports: Download detailed error diagnostics and XML sitemap corrections in CSV format.

How to Validate Hreflang Tags

Enter your primary website URL or paste a list of international localized URLs.
Select your auditing mode (HTML head tags, XML Sitemap, or HTTP headers).
Click Validate Hreflang Tags to inspect cross-page annotations.
Review the matrix showing return-link confirmation status and ISO code validity.
Export the diagnostic spreadsheet to share required fixes with your localization team.