Fetches the URL you give it plus every page in its hreflang cluster, then validates: bidirectional linking (each alternate must link back), ISO 639-1 language + ISO 3166-1 region codes, self-reference, x-default, canonical-vs-hreflang conflicts, and sitemap hreflang parity. Exports a fix prompt + a ready-to-paste <link> block.
Why bidirectional links matter → · Deep-dive blog → · Need the fix? Use the Hreflang Generator →
The tool fetches your URL, reads every <link rel="alternate" hreflang="…">, then fetches each alternate and checks whether it links back to every other member of the cluster. Limit: 12 alternates per audit (keeps the probe cost reasonable).