deepl-mcp.md

DeepL MCP Server

MCP server

from"DeepL"

120

DeepL maintains this official local MCP server and publishes it as deepl-mcp-server on npm. It exposes text and document translation, rephrasing, language metadata, glossary lookup and read-only style-rule lookup over stdio.

Not for: Editing style rules or using DeepL without an API plan. Style rules are read-only here, and the local server exits if DEEPL_API_KEY is missing.

Source and setup verified on 2026-11-05

AI & ML

DeepLtranslationdocumentsglossaries

View on GitHub

Quick facts

Maintainer: DeepL (official)
npm package: deepl-mcp-server 1.3.15
Transport: stdio
Authentication: DEEPL_API_KEY
UI: None; tools only

What you can do

translate-text with formality, glossary and style options
translate-document for PDF, DOCX, PPTX, XLSX, HTML, TXT and other formats
rephrase-text with style and tone
List and inspect glossaries
Read style rules and custom instructions

Requirements

Node.js 18 or newer
A DeepL API plan
A DeepL API key from the account

setup.md

# 1. Test the package

$DEEPL_API_KEY=your-api-key npx -y deepl-mcp-server

# 2. Register it with the client

Use the JSON configuration below or the documented claude mcp add command.

# Claude Desktop or another JSON-configured client → claude_desktop_config.json

{
  "mcpServers": {
    "deepl": {
      "command": "npx",
      "args": ["-y", "deepl-mcp-server"],
      "env": {
        "DEEPL_API_KEY": "your-api-key"
      }
    }
  }
}

Always confirm the latest setup instructions with the maintainer before installing.

>Questions

Is this the official DeepL MCP server?

Yes. DeepL owns the repository and publishes the deepl-mcp-server npm package.

Can it translate files?

Yes. translate-document reads a local input file and writes the translated file on the machine running the server.

Does DeepL MCP have inline UI?

No. The repository documents stdio tools and does not register a ui:// MCP App resource.

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