DeepL MCP Server is DeepL's official MCP server (DeepL/deepl-mcp-server, npm deepl-mcp-server) that exposes DeepL's high-quality neural translation, document translation, rephrasing, and glossary/style-rule lookups as MCP tools for Claude, Cursor, and other clients. Built by DeepL, it is officially maintained and best for API & Web.
by DeepL
About
DeepL MCP Server is DeepL's official MCP server (DeepL/deepl-mcp-server, npm deepl-mcp-server) that exposes DeepL's high-quality neural translation, document translation, rephrasing, and glossary/style-rule lookups as MCP tools for Claude, Cursor, and other clients. Its core tool, translate-text, translates a single string or an array of strings into a target language with optional source-language auto-detection, formality control (less/more/prefer_less/prefer_more), glossary and style-rule application, tone/context hints, and formatting preservation. translate-document translates whole files — PDF, DOCX, PPTX, XLSX, HTML, TXT and more — reading and writing them on the machine running the server, deriving an output path like report_de.pdf when none is given. rephrase-text rewrites text (optionally into another language) with style and tone options, powering DeepL Write-style polishing. Additional tools list accepted source and target language codes, enumerate account glossaries and their dictionary term entries per language pair, and list style rules. Language codes are ISO 639-1 with optional region (en-US), and target codes that require a region get sensible defaults (en→en-US, pt→pt-BR, zh→zh-Hans). Authentication uses a DeepL API key supplied via the DEEPL_API_KEY environment variable; the server exits immediately if it is unset.
Trust verdict
How grades are computed →Grade A (98/100, reliable) from 1 measured signal, based on repository evidence. Only one signal stands behind it, so treat the grade as provisional.
What was measured
- Repository maintenance100/100 · weight 20
The repository has been pushed to or released within the last six months. — last push 2026-05-05.
- Source verification100/100 · weight 25
The repository URL was confirmed to resolve against the live GitHub API and is not archived.
- Provenance90/100 · weight 10
Published and maintained by the vendor of the service it connects to, rather than by a third party.
- Listing ↔ repository match100/100 · weight 5
The listing name lines up with the linked repository DeepL/deepl-mcp-server.
What could not be measured
These contributed nothing to the score — not a penalty, not a zero. They are why the confidence reads the way it does.
- Live MCP handshakeunknown
No remote endpoint to handshake — this server installs and runs locally over stdio, so there is nothing to probe from the outside.
- Measured uptimeunknown
No probe history recorded for this server yet.
- Tool-schema stabilityunknown
Drift is a difference between two successive checks, and this server has none recorded.
Installation
claude mcp add deepl --env DEEPL_API_KEY=your-api-key -- npx -y deepl-mcp-serverdeepl-mcp-server confirmed live on the npm registry — checked August 17, 2026.
Categories
Frequently Asked Questions
What is DeepL MCP Server?
Who built DeepL MCP Server?
Is DeepL MCP Server free?
How do I install DeepL MCP Server?
What does DeepL MCP Server integrate with?
Repo Health
Local/stdio install — runs on your machine, so there is no remote endpoint to verify live. Trust signal below is from the source repo.
- Last commit
- 4mo ago
- Install
- npm
Quick Info
- Install Type
- npm
- Author
- DeepL
- Categories
- 2
- Integrations
- 5
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