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How to connect PDF Blocks MCP with ChatGPT Work

Connect ChatGPT Work to PDF Blocks MCP. Merge three pdfs and add watermark, split pdf into separate page files, and more using natural language, with authentication handled for you.

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PDF Blocks is a synchronous PDF processing API for merging, splitting, watermarking, securing, and reorganizing documents. Use it to automate PDF workflows with fast, programmatic operations.

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How to connect PDF Blocks MCP with ChatGPT Work

ChatGPT Work is an agent inside ChatGPT built for your most ambitious work. It takes action across your apps and files, stays with a project for hours, and turns 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 PDF Blocks account to ChatGPT Work via Composio Connect, so it can merge your PDFs, split documents, add watermarks, secure files, and reorder pages through natural language commands without ever putting your account credentials at risk.

Also integrate PDF Blocks with

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Why use Composio over default connectors?

  • Apps with read and write access. Default connectors mostly can read your data. Composio's PDF Blocks integration lets ChatGPT Work 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 with access to ChatGPT Work (rolling out across Pro, Enterprise, Edu, Plus, and Business plans). We will use the ChatGPT desktop app, which is available on every plan.
  • Access to the PDF Blocks workspace you want to connect.
  • Composio MCP.

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 PDF Blocks to ChatGPT Work

1. Open the MCP settings

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

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

3. Authenticate

Click Authenticate, log in via Composio, and click Allow access to authorize ChatGPT Work to use your Composio account.

Composio login and Allow access screen for ChatGPT Work MCP setup

4. Start using Composio

That is it - Composio tools are now available in ChatGPT Work. Ask it to work with your PDF Blocks account and it will run the actions you authorize.

What you can do after connecting PDF Blocks

  • Merge three PDFs and add watermark
  • Split PDF into separate page files
  • Protect PDF with password and permissions

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 Work 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 PDF Blocks action and event your agent gets out of the box.

Add Image Watermark

Add a PNG or JPEG image as a watermark on all or selected PDF pages.

Add PDF Password

Create an encrypted copy of a PDF that requires a password to open.

Add PDF Restrictions

Create an encrypted PDF copy with explicit permissions for copying, editing, printing, forms, assembly, and accessibility.

Add Text Watermark

Add up to three styled text lines as a watermark on all or selected PDF pages.

Extract PDF Pages

Create a PDF containing selected source pages in their original order.

Merge PDFs

Merge PDF files into one PDF in the exact order provided.

Remove PDF Pages

Create a PDF with selected pages removed while preserving the remaining page order.

Remove PDF Password

Create an unencrypted copy of a password-protected PDF using its current password.

Remove PDF Restrictions

Create a PDF copy with permission restrictions cleared.

Remove PDF Signatures

Create a PDF copy with all digital signatures and timestamps removed.

Reorder PDF Pages

Create a PDF in an exact page order, optionally dropping or repeating source pages.

Reverse PDF Pages

Create a PDF with the complete page order reversed.

Rotate PDF Pages

Rotate all or selected PDF pages by a supported multiple of 90 degrees.

Split PDF at Page

Split a PDF into exactly two downloadable PDFs at a page boundary; the selected page starts the second PDF.

Split PDF by Page Count

Split a PDF into consecutive downloadable PDFs containing up to a fixed number of pages each.

Split PDF by Page Groups

Create one downloadable PDF for each caller-defined ordered group of source pages.

Split PDF by Size

Split a PDF into downloadable PDFs no larger than a requested byte limit.

FRAMEWORKS

How to build PDF Blocks MCP Agent with another framework

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Claude Cowork

Use PDF Blocks MCP with Claude Cowork

Hermes logo

Hermes

Use PDF Blocks MCP with Hermes

FAQ

Frequently asked questions

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

Yes, you can. ChatGPT Work 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 PDF Blocks tools.

Yes, absolutely. You can configure which PDF Blocks 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 PDF Blocks data and credentials are handled as safely as possible.

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