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DeepL API

About DeepL API

Content is translated from English using DeepL Pro.

DeepL API enables the seamless and secure integration of translation capabilities into your websites and applications through an HTTP interface.

 

DeepL provides official open-source libraries to help you create these backend implementations, available in Python, Node, .NET, PHP, Ruby and Java. Learn more here.

 

DeepL API does not allow calls directly from browser-based applications. Requests sent to DeepL API from a browser will fail with an HTTP 403 Forbidden status code and an error message "blocked by CORS policy".

 

 

DeepL API documentation

Consult the DeepL API documentation (available in English) for detailed information on the request parameters and request methods required for each API function. 

 

Security guidance

Never reveal your API key in publicly accessible code.

Requests to third-party APIs from frontend applications would expose your credentials on the web, leaving your account vulnerable to fraud and abuse e.g., racking up high usage costs on a DeepL API Pro plan. 

 

If your API key has been exposed, immediately do the following: 

  1. Log in to your DeepL account, and go to Account
  2. Navigate to the API keys & Limits tab
  3. Create a new key: click Create new key and again to confirm
  4. Deactivate the compromised key: click the more options icon ellipsis-vertical.svg, then Deactivate key

Route your requests through your own backend servers to ensure safe use the DeepL API on your website or application. This keeps your credentials hidden and allows you to specify CORS policies and rate limits as required by your use case. Make sure to secure your backend servers against unauthorized access.

 

Plugins

Plugins are developed and maintained by the respective plugin provider. Should you encounter difficulties when using a plugin, check that your plugin is up to date. In the case of questions, you should contact the plugin provider.

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