formfill-mcp

Fill any interactive PDF form from your AI agent — tax forms, HR paperwork, legal documents — in a single tool call.

CommunityOnlineNo sign-inGlobalFreeRead-only

What it can do

  • List Form Fields: List all fillable fields in a PDF form. Args: pdf_path: Absolute path to the PDF file on disk. api_key: Your FormFill API key (get one at formfill.plenitudo.ai). Returns a JSON objec
  • Fill Form: Fill a PDF form and save the result to disk. Args: pdf_path: Absolute path to the source (blank) PDF form. field_values: Dict mapping field names to string values. Example: {"f1_01[0]": "Jo
  • Fill Form Multipage: Fill a multi-page PDF form and save the result to disk. Identical to fill_form but explicitly iterates page-by-page, which is more reliable for forms where field names repeat acro

What data it sees

Do you need an account

No: the server works without sign-in

Fill any interactive PDF form from your AI agent — tax forms, HR paperwork, legal documents — in a single tool call. Supports W-9, W-4, I-9, lease agreements, insurance forms, and more.

How to connect

How to connect formfill-mcp to Claude

The server address to paste into Claude settings:

https://formfill-mcp--knportal.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect formfill-mcp to ChatGPT

The server address to paste into ChatGPT settings:

https://formfill-mcp--knportal.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect formfill-mcp to Cursor

The server address to paste into Cursor settings:

https://formfill-mcp--knportal.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (3)

Raw names from tools/list. Only developers need these.

list_form_fields List all fillable fields in a PDF form. Args: pdf_path: Absolute path to the PDF file on disk. api_key: Your FormFill API key (get one at formfill.plenitudo.ai). Returns a JSON object with field names, types, and current values. This call does NOT count against your monthly fill quota.
fill_form Fill a PDF form and save the result to disk. Args: pdf_path: Absolute path to the source (blank) PDF form. field_values: Dict mapping field names to string values. Example: {"f1_01[0]": "John", "f1_02[0]": "Doe"} output_path: Absolute path where the filled PDF will be saved. api_key: Your FormFill API key (get one at formfill.plenitudo.ai). Returns a JSON object with success status and output path. This call counts as ONE fill against your monthly quota.
fill_form_multipage Fill a multi-page PDF form and save the result to disk. Identical to fill_form but explicitly iterates page-by-page, which is more reliable for forms where field names repeat across pages or where page-level annotations are used. Args: pdf_path: Absolute path to the source (blank) PDF form. field_values: Dict mapping field names to string values. output_path: Absolute path where the filled PDF will be saved. api_key: Your FormFill API key (get one at formfill.plenitudo.ai). Returns a JSON object with success status, output path, and per-page info. This call counts as ONE fill against your monthly quota.