Is this locale codes reference completely free?

Yes! This locale codes reference is 100% free to use with no signup, registration, or hidden fees. Look up locale codes as many times as you need.

Does this tool work offline?

Yes! Once the page is loaded, you can use this locale reference completely offline without an internet connection.

What is a locale code?

A locale code identifies a specific language and regional variant, like en_US for US English or zh_CN for Simplified Chinese. It's used in software to display content in the user's language and format.

What's the difference between en_US and en_GB?

Both are English locales but for different regions. en_US uses American spelling (color, center) and formats (MM/DD/YYYY), while en_GB uses British spelling (colour, centre) and formats (DD/MM/YYYY). Currency symbols and measurement units also differ.

Should I use underscore or hyphen in locale codes?

Both formats exist: en_US (POSIX/Unix standard) and en-US (BCP 47/IETF standard). Modern web applications typically use hyphens (en-US) following BCP 47, while backend systems often use underscores. Check your framework's convention.

Do I need to support every locale?

No, focus on your target markets. Start with your primary audience's locale, then expand based on user demographics and business needs. Supporting 5-10 major locales often covers 80%+ of global users.

What's the difference between i18n and l10n?

i18n (internationalization) is designing software to support multiple locales without code changes. l10n (localization) is adapting content for a specific locale, including translations, date formats, and cultural adaptations. i18n enables l10n.

How do I choose the right locale for my users?

Detect locale from: 1) User preference settings, 2) Browser Accept-Language header, 3) IP geolocation, 4) Domain/subdomain (.co.uk), in that priority order. Always provide a manual language selector as fallback.

Free Online Locale Codes Reference

Free online reference of locale codes (language-region) for internationalization. No signup required. Essential for i18n, l10n, and multilingual applications. 100% free and works offline.

59 locales

Code	Language	Region
`en_US`	English	United States
`en_GB`	English	United Kingdom
`en_CA`	English	Canada
`en_AU`	English	Australia
`zh_CN`	Chinese	China (Simplified)
`zh_TW`	Chinese	Taiwan (Traditional)
`zh_HK`	Chinese	Hong Kong (Traditional)
`es_ES`	Spanish	Spain
`es_MX`	Spanish	Mexico
`es_AR`	Spanish	Argentina
`fr_FR`	French	France
`fr_CA`	French	Canada
`de_DE`	German	Germany
`de_AT`	German	Austria
`de_CH`	German	Switzerland
`it_IT`	Italian	Italy
`pt_BR`	Portuguese	Brazil
`pt_PT`	Portuguese	Portugal
`ja_JP`	Japanese	Japan
`ko_KR`	Korean	South Korea
`ru_RU`	Russian	Russia
`ar_SA`	Arabic	Saudi Arabia
`ar_EG`	Arabic	Egypt
`hi_IN`	Hindi	India
`th_TH`	Thai	Thailand
`vi_VN`	Vietnamese	Vietnam
`id_ID`	Indonesian	Indonesia
`ms_MY`	Malay	Malaysia
`tr_TR`	Turkish	Turkey
`pl_PL`	Polish	Poland
`nl_NL`	Dutch	Netherlands
`nl_BE`	Dutch	Belgium
`sv_SE`	Swedish	Sweden
`da_DK`	Danish	Denmark
`no_NO`	Norwegian	Norway
`fi_FI`	Finnish	Finland
`cs_CZ`	Czech	Czech Republic
`hu_HU`	Hungarian	Hungary
`ro_RO`	Romanian	Romania
`el_GR`	Greek	Greece
`he_IL`	Hebrew	Israel
`uk_UA`	Ukrainian	Ukraine
`bg_BG`	Bulgarian	Bulgaria
`hr_HR`	Croatian	Croatia
`sk_SK`	Slovak	Slovakia
`sl_SI`	Slovenian	Slovenia
`et_EE`	Estonian	Estonia
`lv_LV`	Latvian	Latvia
`lt_LT`	Lithuanian	Lithuania
`fa_IR`	Persian	Iran
`bn_BD`	Bengali	Bangladesh
`ur_PK`	Urdu	Pakistan
`ta_IN`	Tamil	India
`te_IN`	Telugu	India
`mr_IN`	Marathi	India
`gu_IN`	Gujarati	India
`kn_IN`	Kannada	India
`ml_IN`	Malayalam	India
`pa_IN`	Punjabi	India

Free Online Locale Codes Reference Tool Introduction

A comprehensive locale codes reference featuring language and region codes for internationalization. Essential for building multilingual applications, localization, and global software development.

Perfect for developers, translators, and anyone working with internationalization (i18n) and localization (l10n). Each entry includes the locale code, language, region, and common usage.

Free Online Locale Codes Reference User Guide

Understanding Locale Codes

Locale codes combine language and region codes:

Format: language_REGION (e.g., en_US, zh_CN)
Language: ISO 639-1 two-letter code
Region: ISO 3166-1 two-letter code

Frequently Asked Questions

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