A hreflang generator that builds the alternate-link tags multilingual sites need — with BCP-47 locale validation, x-default support, and duplicate detection that most free generators skip. hreflang tells Google and AI engines which language version of a page to serve to which market, preventing duplicate-content confusion across your locales.
Why hreflang matters for international SEO
If you serve the same page in English, Spanish, French, and German, search engines see four URLs with similar content. Without hreflang, Google guesses which one matches a searcher — and guesses wrong often enough to hurt both rankings and UX. hreflang tells every engine which URL is the English version, which is the Spanish version, and which is the catch-all. AI engines also read hreflang to understand your site's structure across languages.
The x-default rule most tools get wrong
x-default tells search engines which URL to show to visitors whose language you do not explicitly serve — it can point to a specific locale page or to your main URL. Google's documentation recommends including it, and its absence is one of the most common hreflang mistakes found in audits. This generator adds it automatically when you enable the option.
Reciprocity: the rule that makes or breaks hreflang
Google requires hreflang sets to be mutually reciprocal: if page A declares page B as an alternate, page B must declare page A too. A one-way link is treated as an error and the whole set can be ignored. The generator emits a complete block per URL — copy it onto each page in the set, and reciprocity holds by construction.
Validating your locales before you publish
Google rejects malformed language codes. Locales must follow BCP-47 (language plus optional region, like es-ES or pt-BR), and each URL can declare any given locale only once. The generator validates every code as you type, flags duplicates, and warns when the same URL appears in multiple rows — so the tags you copy are deployable on the first try.