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Documentation Index

Fetch the complete documentation index at: https://deepl-c950b784-customizations-with-variants.mintlify.app/llms.txt

Use this file to discover all available pages before exploring further.

Get all currently supported source and target languages that can be used for text and document translation.
As of April 2025, supported languages for text improvement (DeepL API for Write) have not yet been added to the /languages endpoint; we’ll be extending the /languages endpoint in the near future to include this information.
To get languages available for glossaries, please see here.
We also provide a spec that is auto-generated from DeepL’s OpenAPI file. You can find it here. To understand how we’ll update the /languages endpoint when we add translation support for a new language or language variant, please see this article.
The example below uses our API Pro endpoint https://api.deepl.com. If you’re an API Free user, remember to update your requests to use https://api-free.deepl.com instead.
Example request: supported target languages
curl -X GET 'https://api.deepl.com/v2/languages?type=target' \
--header 'Authorization: DeepL-Auth-Key [yourAuthKey]'
Example response
[
  {
    "language": "AR",
    "name": "Arabic",
    "supports_formality": false
  },
  {
    "language": "BG",
    "name": "Bulgarian",
    "supports_formality": false
  },
  {
    "language": "CS",
    "name": "Czech",
    "supports_formality": false
  },
  {
    "language": "DA",
    "name": "Danish",
    "supports_formality": false
  },
  {
    "language": "DE",
    "name": "German",
    "supports_formality": true
  },
  {
    "language": "EL",
    "name": "Greek",
    "supports_formality": false
  },
  {
    "language": "EN-GB",
    "name": "English (British)",
    "supports_formality": false
  },
  {
    "language": "EN-US",
    "name": "English (American)",
    "supports_formality": false
  },
  {
    "language": "ES",
    "name": "Spanish",
    "supports_formality": true
  },
  {
    "language": "ES-419",
    "name": "Spanish (Latin American)",
    "supports_formality": true
  },
  {
    "language": "ET",
    "name": "Estonian",
    "supports_formality": false
  },
  {
    "language": "FI",
    "name": "Finnish",
    "supports_formality": false
  },
  {
    "language": "FR",
    "name": "French",
    "supports_formality": true
  },
  {
    "language": "HU",
    "name": "Hungarian",
    "supports_formality": false
  },
  {
    "language": "ID",
    "name": "Indonesian",
    "supports_formality": false
  },
  {
    "language": "IT",
    "name": "Italian",
    "supports_formality": true
  },
  {
    "language": "JA",
    "name": "Japanese",
    "supports_formality": true
  },
  {
    "language": "KO",
    "name": "Korean",
    "supports_formality": false
  },
  {
    "language": "LT",
    "name": "Lithuanian",
    "supports_formality": false
  },
  {
    "language": "LV",
    "name": "Latvian",
    "supports_formality": false
  },
  {
    "language": "NB",
    "name": "Norwegian (Bokmål)",
    "supports_formality": false
  },
  {
    "language": "NL",
    "name": "Dutch",
    "supports_formality": true
  },
  {
    "language": "PL",
    "name": "Polish",
    "supports_formality": true
  },
  {
    "language": "PT-BR",
    "name": "Portuguese (Brazilian)",
    "supports_formality": true
  },
  {
    "language": "PT-PT",
    "name": "Portuguese (European)",
    "supports_formality": true
  },
  {
    "language": "RO",
    "name": "Romanian",
    "supports_formality": false
  },
  {
    "language": "RU",
    "name": "Russian",
    "supports_formality": true
  },
  {
    "language": "SK",
    "name": "Slovak",
    "supports_formality": false
  },
  {
    "language": "SL",
    "name": "Slovenian",
    "supports_formality": false
  },
  {
    "language": "SV",
    "name": "Swedish",
    "supports_formality": false
  },
  {
    "language": "TR",
    "name": "Turkish",
    "supports_formality": false
  },
  {
    "language": "UK",
    "name": "Ukrainian",
    "supports_formality": false
  },
  {
    "language": "ZH",
    "name": "Chinese (simplified)",
    "supports_formality": false
  },
  {
    "language": "ZH-HANS",
    "name": "Chinese (simplified)",
    "supports_formality": false
  },
  {
    "language": "ZH-HANT",
    "name": "Chinese (traditional)",
    "supports_formality": false
  }
]

​
Query parameters

​
type
enum
Supported values are source or target. If type parameter is not included, defaults to source.