ChangeThisFile

ChangeThisFile MCP Server

Use ChangeThisFile's seven file tools from any MCP client: conversion across 1,000+ supported routes, document translation, table extraction, exact-size compression, natural-language routing, and job status checks.

Powered by ChangeThisFile.com. Discovery and paid-preview jobs are public. General convert_file works without a key for 25 conversions per month per network; after that it needs a free verified developer key (25 conversions/month, shared with the REST API), and paid API plans raise the limit.

Tools

Option 1 — Remote endpoint (recommended, no install)

The server is hosted at https://changethisfile.com/mcp using streamable HTTP transport (MCP spec 2025-03-26). If your client supports remote MCP servers, point it straight at the endpoint. Clients that support custom headers can send Authorization: Bearer ctf_sk_... to use authenticated developer metering.

{

"mcpServers": { "changethisfile": { "type": "streamable-http", "url": "https://changethisfile.com/mcp" } } }

Claude Code:

claude mcp add --transport http changethisfile https://changethisfile.com/mcp

Option 2 — Local stdio server (this package)

For clients that only speak stdio, this package bridges stdio ↔ the hosted endpoint:

{

"mcpServers": { "changethisfile": { "command": "npx", "args": ["-y", "github:aadilr/changethisfile-mcp"], "env": { "CTF_API_KEY": "ctf_sk_your_key_here" } } } }

CTF_API_KEY is optional: without it you get 25 free conversions per month per network; after that convert_file asks for a key. Get a verified free key from the ChangeThisFile dashboard (or POST https://changethisfile.com/v1/keys/free with {"email":"you@example.com"} and click the verification email); its 25 monthly conversions are shared across MCP and REST. Paid plans start at $29/month.

Or clone and run directly:

git clone https://github.com/aadilr/changethisfile-mcp.git

cd changethisfile-mcp npm install node index.js

Option 3 — Agent Skill / Claude Code plugin

This repo doubles as an Agent Skill and Claude Code plugin.

Any skills-capable agent (Claude Code, Codex CLI, Cursor, Gemini CLI, Copilot, and more):

npx skills add aadilr/changethisfile-mcp

Claude Code plugin (bundles the MCP server + the skill):

/plugin marketplace add aadilr/changethisfile-mcp

/plugin install changethisfile@changethisfile

The file-conversion skill prefers the MCP tools when connected and otherwise falls back to a bundled script (skills/file-conversion/scripts/convert.sh) that talks to the hosted endpoint over plain HTTPS — no MCP client required.

Option 4 — Docker

docker build -t changethisfile-mcp .

docker run -i --rm -e CTF_API_KEY changethisfile-mcp

Quick test

curl -X POST https://changethisfile.com/mcp \

-H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'

Supported formats

Use list_conversions for the full route table.

Environment variables

Privacy & limits

• Discovery and paid-preview jobs require no account. General conversion is temporarily anonymous in compatibility mode; a verified key enables shared developer metering now.
• Files are processed server-side and auto-deleted within 24 hours; download URLs expire after 1 hour.
• MCP inputs are capped at 25 MB. Authenticated convert_file uses the developer account's shared API/MCP rate and monthly quota; other expensive tools retain per-account or per-IP abuse limits.

License

MIT