How to connect DeepL with ChatGPT

Connect ChatGPT to DeepL MCP. Translate product copy into french and spanish, improve this customer email for clearer english, and more using natural language, with authentication handled for you.

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DeepL MCP is a provider-hosted translation and writing assistant server powered by DeepL. It helps deliver accurate multilingual translations and clearer writing through a single MCP connection.

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How to connect DeepL MCP with ChatGPT

ChatGPT can take action across your apps and files, stay with a project for hours, and turn a goal into finished materials like sheets, slides, and docs, not just answers.

In this guide, I will explain the easiest and most secure way to connect your DeepL account to ChatGPT via Composio Connect, so it can translate text, translate documents, improve your writing, find supported languages, and automate localization through natural language commands without ever putting your account credentials at risk.

Also integrate DeepL MCP with

Claude Cowork Hermes Atomic Agent

Why use Composio over default connectors?

Apps with read and write access. Default connectors mostly can read your data. Composio's DeepL integration lets ChatGPT take actions like creating drafts, sending updates, labeling records, and more.
1,500+ SaaS toolkits out of the box. Composio gives you instant access to a vast catalog of pre-built connectors, from Gmail and Slack to Notion, Linear, and Salesforce.
One MCP server for every app. Connect any of your applications on demand through a single endpoint, rather than juggling a separate server for each app.
Smart, context-aware tool loading. Unlike traditional MCP servers that dump every available tool into the LLM context window, Composio searches for and loads only the tools relevant to the task at hand.
Cross-app automation. Chain actions across multiple apps in a single run - fetch a thread, summarize it in Notion, and post highlights to Slack without leaving the conversation.

Prerequisites

A ChatGPT account. We will use the ChatGPT desktop app, and the steps are the same on the web.
Access to the DeepL workspace you want to connect.
Composio plugin.

Note: Composio connects through OAuth. You will be asked to sign in and approve specific permissions. Review the permission screen carefully if you are using a work account.

Step-by-step: Connect DeepL to ChatGPT

1. Install the Composio plugin

Click the button. ChatGPT opens the Composio plugin page. Click Install plugin.

Install in ChatGPT

Composio plugin page in ChatGPT with the Install plugin button

You can also find it inside ChatGPT: go to Settings, open Plugins, search the marketplace for Composio, and click Install plugin.

2. Authenticate

After you install, ChatGPT asks you to authenticate with Composio. Log in and click Allow access to authorize ChatGPT to use your Composio account.

Composio login and Allow access screen for ChatGPT

3. Start using Composio

That is it. Composio tools are now available in ChatGPT. Type @Composio followed by your request, for example @Composio find unread DeepL messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize DeepL.

Option 2: Add Composio as an MCP server

If you cannot use the plugin marketplace, add Composio as a custom MCP server instead.

1. Open the MCP settings

In ChatGPT, go to Settings and open the Plugins section. Inside the Plugins page, click the MCP tab.

ChatGPT settings showing the Plugins page with the MCP tab selected

2. Add the server

Click Add server. In the Name field enter Composio, for Type select Streamable HTTP, and in the URL field paste the Composio MCP server URL:

bash

https://connect.composio.dev/mcp

ChatGPT Add server dialog with the name Composio, type Streamable HTTP, and the Composio MCP URL

Then click Save. The Composio server now appears in your MCP plugins list.

ChatGPT Plugins page showing the Composio MCP server added to the list

3. Authenticate

Click Authenticate on the Composio entry, log in via Composio, and click Allow access. Composio tools are then available in ChatGPT the same way as with the plugin.

What you can do after connecting DeepL

Translate product copy into French and Spanish
Improve this customer email for clearer English
List languages supported for document translation

Security + privacy notes (important)

Use least-privilege access: Only grant permissions you actually need.
Review OAuth permissions before approving: Make sure requested scopes match what you expect Composio and ChatGPT to do.
Keep write actions human-reviewed: For actions like sending messages, creating labels, or editing drafts, keep manual confirmation enabled.
Be careful with sensitive data: Avoid using this setup with highly sensitive information unless allowed by your personal, company, or client policies.

TOOLS

Supported Tools

Every DeepL MCP action and event your agent gets out of the box.

Correct-text

Correct one or more texts for typos, grammar and punctuation errors using DeepL.

Download-document

Get a download link for a translated document once its status is 'done'.

Get-document-status

Check the translation status of a document session.

Get-source-languages

Get the source language codes supported by DeepL for translation, e.

Get-target-languages

Get the target language codes supported by DeepL for translation, e.

Rephrase-text

Rephrase text in the same or a different language using DeepL.

Translate-text

Translate text to one or more target languages using DeepL.

Upload-document

Translate a whole file or document, preserving its original layout and formatting.

Upload-document-show-fallback-widget

Second step of a document translation, for when the file bytes cannot be sent to 'uploadUrl': shows the user an upload widget for the upload session that upload-document already reserved, so they can select the file themselves.

FRAMEWORKS

How to build DeepL MCP Agent with another framework

Claude Cowork

Use DeepL MCP with Claude Cowork

Hermes

Use DeepL MCP with Hermes

Atomic Agent

Use DeepL MCP with Atomic Agent

MORE TOOLKITS

Explore Other Toolkits

Toolkit marketplace

Google Drive

Oauth2

Google Drive is a cloud storage platform for uploading, sharing, and collaborating on files. It's perfect for keeping your documents accessible and organized across devices.

Google Docs

Oauth2

Google Docs is a cloud-based word processor that enables document creation and real-time collaboration. Its seamless sharing and version history make team editing and content management a breeze.

Google Super

Oauth2Api Key

Google Super is an all-in-one suite combining Gmail, Drive, Calendar, Sheets, Analytics, and more. It gives you a unified platform to manage your digital life, boosting productivity and organization.

ActiveMerge

Api Key

ActiveMerge is a document automation platform for generating documents, images, merged files, and e-signature workflows. It helps teams turn templates and stored files into finished, shareable documents faster.

FAQ

Frequently asked questions

With a standalone DeepL MCP server, the agents and LLMs can only access a fixed set of DeepL tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from DeepL and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. ChatGPT fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right DeepL tools.

Yes, absolutely. You can configure which DeepL scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your DeepL data and credentials are handled as safely as possible.

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