Hreflang

Hreflang is an HTML attribute used within `<link>` tags to tell search engines that multiple language or regional versions of a page exist and which version should appear in search results for users in each locale. The attribute follows the format `hreflang="xx"` for language-only targeting (e.g., `hreflang="en"` for English) or `hreflang="xx-YY"` for language-plus-region targeting (e.g., `hreflang="pt-BR"` for Brazilian Portuguese). Every page in a multilingual set must reference all other versions, including itself, creating a complete bidirectional map that search engines can crawl. A special `hreflang="x-default"` value designates the fallback page for users whose language or region does not match any specified version.

Without hreflang tags, search engines face two problems with multilingual sites. First, they may display the wrong language version to users — showing an English page to a German speaker, for example — which hurts user experience and increases bounce rates. Second, search engines may treat translated pages as duplicate content and apply ranking penalties, since the pages share similar structure and intent. Correct hreflang implementation solves both issues: it directs each user to the right language version and tells search engines that the translated pages are intentional alternatives, not duplicates. For publishers with international audiences, proper hreflang configuration can significantly improve organic traffic from non-English search markets.

FlipLink's marketing site at fliplink.me implements hreflang tags across all localized pages — including the blog, glossary, feature pages, tool pages, and comparison pages — through its [localization](/features/localization) infrastructure powered by next-intl. Each page automatically includes `<link rel="alternate" hreflang="...">` elements pointing to all eight available language versions (English, Italian, Spanish, German, Japanese, Portuguese-BR, Russian, and Dutch), plus an `x-default` pointing to the English version. This ensures that search engines index each translation correctly and serve the right version based on the searcher's language and location. For your own published flipbooks and documents, hreflang applies to your hosting pages rather than the flipbook viewer itself — if you embed a FlipLink publication on a multilingual website, adding hreflang tags to your embedding pages ensures visitors arrive at the correct language version from search results.