Introduction

Welcome to the developer home of DeepL API.

Get an API key and get started

New user? Follow these quick steps to get started with the DeepL API.

Sign up for the API

Visitour plans page, choose a plan, and sign up.

If you already have a DeepL Translator account, you will need to log out andcreate a new account for the DeepL API.

Step 2: Test your API key with a request

Find your API keyhere.Then try making a simple translation request in one of these ways:

cURL or an HTTP request
withour client libraries forPython,JavaScript,PHP,.NET,Java, orRuby
in our playground
in Postman

If you use the sample code below, be sure to replace{YOUR_API_KEY} with your own API key.

HTTP Request
cURL
Python
JavaScript
PHP
C#
Java
Ruby

If you chose a free API plan and you are writing cURL or HTTP requests, replacehttps://api.deepl.com withhttps://api-free.deepl.com.

Sample request

POST /v2/translate HTTP/2Host: api.deepl.comAuthorization: DeepL-Auth-Key [yourAuthKey]User-Agent: YourApp/1.2.3Content-Length: 45Content-Type: application/json{"text":["Hello, world!"],"target_lang":"DE"}

Sample response

{  "translations": [    {      "detected_source_language":"EN",      "text":"Hallo, Welt!"    }  ]}

Step 3: Keep building with our client libraries and how-to guides

Our official client libraries let you use the API with six popular programming languages -Python,JavaScript,PHP,.NET,Java, orRuby. The DeepL community hascontributed client libraries for other languages, includingDart,Go, andRust. You may also wish to check outthese examples and guides.

Keep exploring

Your first API request - With just a few lines of code, make your first request to the DeepL Translate or Write API
DeepL 101 - A quick guide to text and document translation, using Postman to play with the API, client libraries for your favorite programming language, and joining our developer community
Cookbook - Explore short tutorials, examples, projects, and use cases
Guides - Discover in-depth explanations for API features and real-world applications