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:

• DeepL Write API

Q3 2024

• Added the show_billed_characters parameter for text translation, allowing users to optionally include the number of billed characters in the API response. Learn more here.

• Added support for a new language for text translation: ZH-HANT (Traditional Chinese). As of this initial release, document translation is not supported for Traditional Chinese. More information is available here.

• An official Ruby client library, evolved from a community-written library by Daniel Herzog. You can download it here or find the source code on our GitHub page.

Q2 2024

• Added support for DOCX and PPTX document minification to the PHP client library, making it possible for users to translate documents that exceed DeepL's file size limit due to embedded media. Learn more here.

• Added support for API key-level usage reporting. More information is available in the multiple API keys guide.

• Launched DeepL Pro in 165 new markets, bringing the total number of markets where DeepL Pro is available to 228. This means users with billing addresses in these markets can create DeepL Pro API and Free API subscriptions.

• Added support for new glossary languages: DA (Danish), NB (Norwegian Bokmål), and Swedish (SV).

• Moved the context parameter from alpha status to general availability. More information about the context parameter is available in the "Request body descriptions" table here.

• Added support for SRT (srt) files in document translation.

Q1 2024

• Added support for multiple API keys in a single account for Pro API and Free API users. More information is available in the multiple API keys guide.

• 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

• Added 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 NB (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 :)