UnixEpoch

UnixEpoch

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Ressources développeur

Langue

Locale Convertirer

Normalize locale identifiers online. Convertir BCP 47 tags, POSIX locale strings, ICU-style values, and Accept-Language headers into clean locale formats with live browser Intl previews.

Paste a locale tag, POSIX locale string, or Accept-Language header.

Actions
Common Inputs
Normalization status

Common Locale Conversion Exemples

Input en_US.UTF-8 Output en-US

Common POSIX locale from shell environments and Linux servers.

Input zh_Hans_CN Output zh-Hans-CN

ICU-style locale with explicit script and region.

Input sr_RS@latin Output sr-Latn-RS

POSIX modifier converted into a script subtag.

Input Accept-Language: fr-CA,fr;q=0.9 Output fr-CA

Browser header reduced to the primary requested locale.

Comment utiliser cet outil

  1. Enter a locale tag, POSIX locale string, or Accept-Language header from your app, browser, or server logs.
  2. Check the canonical BCP 47 locale, POSIX form, HTML lang value, and Accept-Language fallback chain.
  3. Use the preview cards to confirm how Intl resolves dates, numbers, relative time, and sorting for that locale.

Ce que cette page explique

  • How do I convert en_US.UTF-8 into a browser locale tag?
  • What locale should I put in an HTML lang attribute or Intl API call?
  • How does an Accept-Language header map to a primary requested locale?
  • Which locale does the browser actually resolve for numbers, dates, and sorting?

Questions fréquentes

What does this locale converter normalize?

It normalizes common locale inputs such as en_US.UTF-8, zh_Hans_CN, sr_RS@latin, and Accept-Language headers into cleaner locale formats for browser and application use.

What is the difference between BCP 47 and POSIX locale formats?

BCP 47 uses dash-separated tags like en-US for web and Intl APIs, while POSIX locale strings often use underscores and charsets such as en_US.UTF-8 for servers and shell environments.

Can I parse an Accept-Language header here?

Yes. Paste a full header such as Accept-Language: fr-CA,fr;q=0.9 and the tool extracts the primary locale and shows a fallback chain.

Why do resolved locales differ from the requested locale?

Browser Intl APIs can fall back to a supported parent locale or canonical variant. The resolved locale cards show what NumberFormat, DateTimeFormat, ListFormat, RelativeTimeFormat, and Collator actually use.

Is this locale converter online only or does it call a server API?

The parsing and preview logic run in the browser, so you can inspect locale behavior instantly without sending the locale input to a conversion API.

Outils associés

Convertisseur de formats de date Convertir the same input date into ISO 8601, SQL, Unix timestamp, and other formats once your locale output is ready. Convertisseur de fuseaux horaires Check how localized time values look when you still need to switch between UTC and local timezones. Locale Convertirer Guide Learn when to use BCP 47 tags, POSIX locale strings, and Accept-Language headers in browser and backend workflows.