Browser Language Detection (Server-Side)
We use the Accept-Language HTTP request header sent by your browser to detect your preferred languages. This is how websites automatically choose the right language for you.
No languages detected in Accept-Language header.
Languages Detected by JavaScript (Client-Side)
We use the "navigator.languages" JavaScript variable to detect your browser language preferences. Languages are sorted by preference with the most preferred language first.
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Detecting languages...
Browser Information
Key Features
- Detect browser language preferences instantly
- Server-side detection using Accept-Language HTTP header
- Client-side detection using JavaScript navigator.languages
- Display language codes and full language names
- Show preference scores for each language
- Visual progress bars for language preferences
- Copy language codes with one click
- View raw Accept-Language header
- Display browser information (User Agent, Platform)
- No configuration needed - instant results
Common Use Cases
- Test multi-language website implementations
- Debug language detection and localization issues
- Verify Accept-Language header is sent correctly
- Test automatic language redirection logic
- Understand browser language preference settings
- QA testing for internationalized applications
- Check language fallback mechanisms
- Verify language negotiation in APIs
- Test CDN and server-side language routing
- Educational purposes - learn how browsers communicate language preferences
How to Use
- Simply load this page - detection happens automatically
- View server-side detected languages from Accept-Language header
- Check the preference scores to see language priority
- View client-side detected languages from JavaScript
- Copy any language code by clicking the "Copy" button
- Check your browser information at the bottom
- To test different languages, change your browser language settings
- Refresh the page to see updated language preferences
Frequently Asked Questions
The Accept-Language HTTP header is sent by your browser with every request. It tells the server which languages you prefer, allowing websites to automatically display content in your language.
Preference scores (quality values) range from 0 to 1. A score of 1.0 means highest preference. Lower scores indicate less preferred languages. Browsers use this to indicate your language priority.
They may differ because the Accept-Language header is configured in browser settings, while navigator.languages reflects the browser's actual language configuration. Some browsers may have different values for each.
In Chrome: Settings → Languages. In Firefox: Settings → Language. In Safari: System Preferences → Language & Region. After changing, refresh this page to see updated results.
navigator.languages is a JavaScript property that returns an array of language codes representing the user's preferred languages, ordered by preference. The first element is the most preferred language.
Proper language detection improves user experience by automatically displaying content in the user's preferred language. It's essential for internationalized websites and applications.
Yes! This tool helps you verify that your browser is sending the correct Accept-Language header and that your language preferences are configured properly.
This is rare but can happen if your browser doesn't send the Accept-Language header or if JavaScript is disabled. Check your browser settings and enable JavaScript.
