Photopea MCP Server

Demo

How It Works

graph LR
    A[Agent] <-->|stdio| B[MCP Server]
    B <-->|WebSocket| C[Browser]
    C <-->|postMessage| D[Photopea]

Your agent sends editing commands through the MCP protocol. The server translates these into Photopea JavaScript API calls and executes them via a WebSocket bridge to the browser.

Note: A browser window will open automatically on the first tool call. This is expected -- Photopea runs entirely in the browser and the server needs it to perform image editing operations.

Quick Start

claude mcp add -s user photopea -- npx -y photopea-mcp-server

Then start a new Claude Code session and ask it to edit images. The Photopea editor will open in your browser automatically on the first tool call.

Installation

Claude Code

npx (recommended):

claude mcp add -s user photopea -- npx -y photopea-mcp-server

Global install:

npm install -g photopea-mcp-server
claude mcp add -s user photopea -- photopea-mcp-server

Claude Desktop

Add to your Claude Desktop config file (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "photopea": {
      "command": "npx",
      "args": ["-y", "photopea-mcp-server"]
    }
  }
}

Cursor

Add to Cursor MCP settings (.cursor/mcp.json in your project or ~/.cursor/mcp.json globally):

{
  "mcpServers": {
    "photopea": {
      "command": "npx",
      "args": ["-y", "photopea-mcp-server"]
    }
  }
}

VS Code (Copilot)

Add to .vscode/mcp.json in your project:

{
  "servers": {
    "photopea": {
      "command": "npx",
      "args": ["-y", "photopea-mcp-server"]
    }
  }
}

Windsurf

Add to Windsurf MCP settings (~/.windsurf/mcp.json):

{
  "mcpServers": {
    "photopea": {
      "command": "npx",
      "args": ["-y", "photopea-mcp-server"]
    }
  }
}

Available Tools

Document (5 tools)

Layer (11 tools)

Text & Shape (3 tools)

Image & Effects (9 tools)

Export & Utility (6 tools)

Usage Examples

Once installed, ask your agent to perform image editing tasks:

Create a poster:

"Create a 1920x1080 document with a dark blue background, add the title 'Hello World' in white 72px Arial, and export it as a PNG to ~/Desktop/poster.png"

Edit a photo:

"Open ~/photos/portrait.jpg, increase the brightness by 30, apply a slight gaussian blur of 2px, and export as JPG to ~/Desktop/edited.jpg"

Composite images:

"Create a 1200x630 document, place ~/assets/background.png as the base layer, then place ~/assets/logo.png and move it to the top-right corner"

Batch adjustments:

"Open ~/photos/sunset.jpg, apply hue/saturation with +20 saturation, apply an unsharp mask with amount 50 and radius 2, then export as PNG"

Development

git clone https://github.com/attalla1/photopea-mcp-server.git
cd photopea-mcp-server
npm install
npm run build

Commands

Architecture

The server has four main components:

MCP Server (src/server.ts) -- Registers all 34 tools with the MCP SDK and connects via stdio transport.

WebSocket Bridge (src/bridge/websocket-server.ts) -- Manages the connection between the MCP server and the browser. Queues script execution requests and handles responses with timeouts.

Script Builder (src/bridge/script-builder.ts) -- Pure functions that translate tool parameters into Photopea JavaScript API calls. Each builder function generates a script string that Photopea can execute.

Browser Frontend (src/frontend/index.html) -- A single-page app that loads Photopea in an iframe, connects to the WebSocket bridge, and relays scripts to Photopea via postMessage. Returns results back through the WebSocket.

src/
  index.ts              # Entry point: HTTP server, browser launch, MCP startup
  server.ts             # MCP server initialization and tool registration
  bridge/
    websocket-server.ts # WebSocket bridge with request queue
    script-builder.ts   # Photopea JS code generators
    types.ts            # Protocol message types
  tools/
    document.ts         # Document operations (5 tools)
    layer.ts            # Layer operations (11 tools)
    text.ts             # Text and shape operations (3 tools)
    image.ts            # Image, adjustment, filter operations (9 tools)
    export.ts           # Export and utility operations (6 tools)
  utils/
    file-io.ts          # Local file read/write, URL fetching
    platform.ts         # Port discovery, browser launch
  frontend/
    index.html          # Browser UI with Photopea iframe

Security

• The MCP server binds to 127.0.0.1 (localhost only) and is not accessible from the network.

• The photopea_run_script tool executes arbitrary JavaScript inside Photopea's sandboxed iframe. It is marked as destructive and requires user approval in MCP clients that support tool annotations.

• File operations (open_file, export_image, place_image) read and write files with the same permissions as the user running the server.

Known Limitations

• Heavy scripts (e.g., gradients with many color steps) may cause the Photopea browser UI to become unresponsive. The operations still complete successfully in the background and exports will work as expected.

• Refreshing the browser page will discard all unsaved work. Export your documents before refreshing.

• Only one browser tab should be open at a time. Multiple tabs will conflict over the WebSocket connection.

• The reorder_layer tool may cause the Photopea UI to become unresponsive. To avoid this, create layers in the desired order rather than reordering after creation.

Requirements

• Node.js >= 18

• A modern web browser (Chrome, Firefox, Edge, Safari)

License

MIT