Release notes

Brief summaries of recent DeepL API releases, such as support for new languages and document formats, new API parameters, and more.

In active development (a couple of highlights):

• Support for multiple API keys in a single subscription

• An official Ruby client library

Q1 2024

• Added support for a new language for text translation: AR (Arabic). As of this initial release, document translation is not supported for Arabic. More information is available here.

• Added support for Korean (KO) as a glossary language, increasing the number of supported glossary language pairs from 55 to 66.

Q4 2023

• Support for Microsoft Excel (xlsx) files in document translation

• Released the context parameter as an alpha feature for text translation (see Request Body Descriptions table for more information)

Q3 2023

• Launched DeepL Pro in South Korea (blog post here). This means users with billing addresses in South Korea can create DeepL Pro API and Free API subscriptions.

• Added support for Portuguese (PT), Russian (RU), and Chinese (ZH) as glossary languages, increasing the number of supported glossary language pairs from 28 to 55.

• Added support for JSON-encoded requests for all remaining endpoints (note that document upload for document translation still requires multipart/form-data).

Q2 2023

• Added support for user-provided http clients in PHP client library.

• Released an official DeepL API Postman collection.

• Added formality support for Japanese (JA) in text and document translation.

• Released in-house PDF translation; removed requirement to send data to the US when translating PDF documents (blog post).

Q1 2023

• Released an official DeepL Custom Connector for Microsoft Power Automate

• Added support for glossaries in any combination of two languages from the following list: EN (English), DE (German), FR (French), IT (Italian), PL (Polish), NL (Dutch), ES (Spanish, JA (Japanese). This represents an increase from 8 to 28 supported glossary language pairs.

• Added XLIFF as a document translation format (note that only documents from version 2.0 are supported, and there is no support for the legacy 1.2 format)

• Added support for new languages for text and document translation: KO (Korean) and NO (Norwegian - bokmål). Blog post here.

Q4 2022

• Moved HTML handling out of beta after fixing the most commonly reported user issues.

• Released an official Java client library.

• Added support for JSON-encoded requests for text translation, usage, and languages endpoints.

Q3 2022

• Released an official PHP client library.

• Added support for a new language for text and document translation: UK (Ukrainian). Blog post here.

Before Q3 2022

• Released an official DeepL API OpenAPI spec.

• Released an official NodeJS client library.

• Released an official .NET client library.

• Released an official Python client library.

• Added support for glossaries in the DeepL API.

• Released an open-source sample project for translating with DeepL in Google Sheets.

...and much more :)