DeepL

DeepL is a neural machine translation API for text and documents. It supports glossaries, style rules, document translation and official client libraries for Python, JavaScript, PHP, C#, Java and Ruby.

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DeepL at a glance

From official pages, checked Oct 5, 2026. Tap the arrow for each source.

Size limit: 128 KiB per request
Headers are limited to 16 KiB; retry 429 responses with exponential backoff.
Official SDKs: PythonJavaScript / TypeScriptPHP.NETJavaRuby
Official client libraries; community libraries cover other languages.
Trains on your data: No
DeepL states Pro customer data is never used to train its models.
Compliance: SOC 2ISO 27001GDPRHIPAA
Listed as ISO 27001, SOC 2 Type II, HIPAA and GDPR certifications.

What you can build with DeepL

DeepLRecipePaste

Translate your app's text with DeepL from Node or Python

Install DeepL's official library, pass your UI strings and a target language, and get natural translations back.

Translation

Recent updatesAll updates

Oct 6, 2026
DeepL document translation adds ten file formats in beta (Sep 29, 2026)
Subtitles (.vtt), Markdown, iOS .strings, YAML, .properties, .resx, .xlsm, .odt, .rtf and SCORM .zip can now be uploaded for translation.