Generate hreflang alternate link tags from a list of language/URL pairs, telling search engines which language or region each page version targets.
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hreflang tags tell search engines that multiple URLs are language or region-specific versions of the same content, so the right version is shown to users in each locale, rather than the pages being treated as duplicate content or the wrong version ranking for a given region. The same complete set of tags (listing every language version) is meant to be placed on every page in the set, including a page listing itself.
The x-default entry specifies which version to show visitors whose language or region doesn't match any of your other listed versions, commonly your default or a language-selector page. It's optional but recommended for sites targeting multiple locales.
Use ISO 639-1 language codes (like 'en', 'fr', 'es'), optionally combined with an ISO 3166-1 region code (like 'en-us' or 'en-gb') for region-specific targeting.
Yes, each page's hreflang set should include a tag pointing to itself as well as to all other language versions, this tool's output is the same complete block meant to be placed on every page in the set.
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