hreflang Audit
Validate international SEO tags across every page in one crawl.
hreflang errors are among the most common and most damaging international SEO issues - and among the hardest to spot manually. Crawly extracts and validates hreflang tags on every page as part of the standard crawl.
Missing x-default tags, malformed language codes, and hreflang pointing to non-200 URLs are all flagged automatically. No separate validator needed.
How it works
- 1
Run a crawl on your international site.
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Crawly extracts all hreflang link tags from every page's HTML.
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Each tag is validated: language code format, x-default presence, and whether the target URL returns a 200.
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Issues are flagged in the Issues tab. Click any issue to see affected pages.
Why it matters
Missing x-default detection
x-default is the most commonly missing hreflang tag. Crawly flags every page that has hreflang tags but no x-default fallback.
Malformed language codes
Common mistakes like en-UK instead of en-GB, or using a country code without a language code, are caught automatically.
Target URL validation
hreflang tags pointing to redirected or broken URLs are flagged - a common problem after migrations that is easy to miss without a crawler.
Use cases
International site audits
Run a full hreflang audit on any international site in a single crawl. Get a page-by-page breakdown of every hreflang issue.
Post-migration validation
After a site migration, verify that hreflang tags are still pointing to valid, 200-returning URLs - not old URLs that now redirect.
New market launches
Before launching a new language or country version, verify that x-default and all existing language tags are correctly implemented.
Related features
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