DeepL API v2/v3

DeepL API v2/v3 provides programmatic access to high-accuracy neural machine translation with advanced glossary management and document handling.

DeepL API v2 remains the primary interface for core text and document translation across 30+ languages, while the v3 endpoints introduce enhanced glossary capabilities: specifically, the ability to edit existing entries and manage multilingual glossaries within a single resource. Developers can integrate these tools via official client libraries for Python, Node.js, and .NET to handle complex tasks like preserving document formatting (DOCX, PDF, PPTX) or applying custom terminology via the /v3/glossaries endpoint. The infrastructure supports both Free and Pro tiers, utilizing distinct endpoints (api-free.deepl.com vs. api.deepl.com) to scale from individual projects to enterprise-grade localization workflows.

https://www.deepl.com/docs-api