How to do multilingual SEO

Multilingual SEO requires treating each language version as a distinct site with its own authority, rather than trying to serve multiple languages from one URL. The most reliable approach is using separate URLs for each language—either subdomains (es.example.com), subdirectories (example.com/es/), or entirely separate domains. Subdirectories are generally preferred because they consolidate domain authority and are easier to maintain. You'll need to implement hreflang tags to tell Google which version of your content targets which language and region. These XML attributes go in your page header or sitemap and explicitly match URLs to their language variants. Without hreflang, Google may struggle to understand your content structure and could penalize you for duplicate content across languages. For example, an English page at example.com/en/services/ should have hreflang tags pointing to example.com/es/services/ and example.com/fr/services/. Include an x-default hreflang pointing to your default version so users without a language preference land on the right page.

Keyword research needs to happen in each target language, not through translation. Machine translation of your English keywords will miss search intent and local terminology. Partner with native speakers or use language-specific keyword tools like Semrush or Ahrefs in each language to find what people actually search for. This is where most agencies slip up—translating page titles and metadata directly from English usually means you're targeting the wrong keywords. Content localization goes beyond translation too. Cultural references, examples, and even formatting may need adjustment. A pricing page for the US market might need significant changes for European markets with different currencies, tax structures, and consumer expectations.

From a technical standpoint, set your language in the HTML lang attribute on each page, ensure your server delivers the correct language version based on user location or URL, and create a language selector that works smoothly. Avoid auto-redirecting users to different language versions based solely on IP address, as this frustrates users and confuses search engines. Let your hreflang tags do the routing work. Each language version needs its own internal linking structure and shouldn't link excessively between language versions—they should be treated as separate crawl paths. Finally, build backlinks and citations in each target language. A Spanish version with only English backlinks signals low credibility. Your link-building and local citation strategy should vary by market.