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Supported languages

PolyLingo supports 36 base languages and 7 regional variants — 43 language codes in total. Pass any code from the tables below as a value in the targets array of any translate endpoint.

Base languages

Code	Language	RTL
`ar`	Arabic	Yes
`bn`	Bengali
`bg`	Bulgarian
`hr`	Croatian
`cs`	Czech
`da`	Danish
`nl`	Dutch
`en`	English
`fi`	Finnish
`fr`	French
`de`	German
`el`	Greek
`he`	Hebrew	Yes
`hi`	Hindi
`hu`	Hungarian
`id`	Indonesian
`it`	Italian
`ja`	Japanese
`ko`	Korean
`ms`	Malay
`no`	Norwegian
`fa`	Persian (Farsi)	Yes
`pl`	Polish
`pt`	Portuguese
`ro`	Romanian
`ru`	Russian
`sk`	Slovak
`es`	Spanish
`sw`	Swahili
`sv`	Swedish
`th`	Thai
`tr`	Turkish
`uk`	Ukrainian
`vi`	Vietnamese
`zh`	Chinese (Simplified)
`zh-TW`	Chinese (Traditional)

Regional variants

Regional variants use BCP-47 language-region subtag codes — the same convention used by browsers, operating systems, and i18n frameworks. Use them when your audience expects a specific regional register, vocabulary, or spelling convention.

Code	Language	Parent
`en-GB`	English (UK)	`en`
`es-ES`	Spanish (Spain)	`es`
`es-MX`	Spanish (Mexico)	`es`
`fr-CA`	French (Canada)	`fr`
`pt-BR`	Portuguese (Brazil)	`pt`
`pt-PT`	Portuguese (Portugal)	`pt`
`zh-HK`	Chinese (Hong Kong)	`zh`

When to use a regional variant

Use the generic code (fr, es, pt) when you need broad coverage or when your audience spans multiple regions. Use a regional code when your content targets a specific market — for example, pt-BR for a Brazilian product or en-GB for a UK publication.

Regional codes and their generic counterparts can be mixed freely in the same request:

{
  "targets": ["fr", "fr-CA", "pt", "pt-BR"]
}

The response includes a separate translation keyed by each code you requested:

{
  "translations": {
    "fr":    "Bonjour le monde",
    "fr-CA": "Allô le monde",
    "pt":    "Olá mundo",
    "pt-BR": "Olá mundo"
  }
}

Discover languages at runtime

GET /languages returns the live canonical list — no hardcoding required:

curl https://api.usepolylingo.com/v1/languages

Response includes every supported code with its display name and RTL flag:

{
  "languages": [
    { "code": "en",    "name": "English",           "rtl": false },
    { "code": "en-GB", "name": "English (UK)",       "rtl": false },
    { "code": "fr",    "name": "French",             "rtl": false },
    { "code": "fr-CA", "name": "French (Canada)",    "rtl": false }
  ]
}

RTL languages

Arabic (ar), Hebrew (he), and Persian/Farsi (fa) are right-to-left. For plain and markdown output the API returns translated text only — set text direction in your UI using CSS direction: rtl or a parent element's dir="rtl" attribute. For html format, dir="rtl" is added to appropriate block-level elements automatically. See the API reference for details.