Test whether a website serves different content based on visitor locale. Detect geo-targeted pages, check hreflang tags, and compare content across languages.
| Locale | Status | Title | Meta Description | H1 | Content Length |
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| Locale | Content-Language | Vary | Redirect URL |
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OneStepToRank monitors your search rankings across locales and service areas 24/7. See exactly how your international SEO performs in each market you target.
Get StartedLocale-adaptive content refers to web pages that serve different versions of their content depending on the visitor's language preference, geographic location, or browser locale settings. Instead of maintaining separate URLs for each language (like /en/page and /fr/page), a locale-adaptive page uses a single URL and dynamically selects the content version based on the incoming Accept-Language HTTP header or IP geolocation.
This approach is common among global brands, SaaS platforms, and e-commerce sites that want to deliver a seamless native-language experience without fragmenting their URL structure. However, it introduces significant SEO challenges if not implemented with the right technical signals.
Google and other search engines typically crawl your site using an en-US locale. If your page serves French content to French visitors but English content to Googlebot, Google will only index the English version. This means your French-language content may never appear in Google.fr search results, even though real French users see it perfectly when they visit directly.
The core issues with improperly configured locale-adaptive pages include:
Vary: Accept-Language is set.If you choose to serve locale-adaptive content on a single URL, follow these best practices:
<link rel="alternate" hreflang="fr" href="https://example.com/page"> pointing back to the same URL.Vary: Accept-Language in your response headers so caches and CDNs know to store separate versions per language.Content-Language header that matches the language of the served content, helping search engines confirm the language./en/, /fr/) if you target more than 3-4 languages. Google recommends this approach for larger international sites as it gives each version a distinct, crawlable address.Use this tool alongside our Hreflang Tag Generator to build correct hreflang tags, and our Local Rank Checker to verify your rankings in each locale you target.
A locale-adaptive page serves different content depending on the visitor's locale or language settings. The server reads the Accept-Language HTTP header or uses IP geolocation to decide which language version to return. This lets a single URL serve content in multiple languages, but requires careful SEO configuration to ensure search engines can discover and index all versions.
When Google crawls your site, it uses an en-US locale. If your page returns different content for different locales on the same URL without hreflang tags, Google may only index one version. This means users searching in other languages will never find your localized content, even though it exists and works perfectly for direct visitors.
Hreflang tags tell search engines which language and regional version of a page to show to users in each locale. They are essential whenever you serve different language content on the same URL or maintain separate URLs for each language. Without them, search engines cannot reliably match the correct language version with the right audience, leading to missed rankings internationally.
The tool sends HTTP requests to your URL with different Accept-Language headers for each selected locale. It then compares the page title, meta description, H1 heading, content length, and response headers across all responses. If any elements differ between locales, the page is flagged as locale-adaptive. The tool also checks for hreflang tags and warns you if adaptive content lacks proper implementation.