Document Tools

PDF Comment Markup

Draw review-style side comments, arrows, and highlight regions on PDF pages

file· File resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

# 1) Upload each file first → returns { filePath }
curl -X POST 'https://api.elysiatools.com/upload/pdf-comment-markup' \
  -F 'file=@/path/to/inputPdf.ext'

# 2) Call the tool with the returned filePath values
curl -X POST 'https://api.elysiatools.com/en/api/tools/pdf-comment-markup' \
  -F 'inputPdf=/Users/quyue/www/elysia-tools/public/samples/pdf/outline-bookmarks-example1.pdf' \
  -F 'markupsJson=[{"page":1,"kind":"highlight","x":14,"y":20,"w":45,"h":8,"text":"Need stronger source"},{"page":1,"kind":"comment","x":20,"y":38,"w":34,"h":9,"text":"Clarify this claim with data.","side":"right"}]' \
  -F 'highlightOpacity=0.26' \
  -F 'noteOpacity=0.95' \
  -F 'noteWidthRatio=0.22'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/pdf-comment-markup

Parameters

Name	Type	Required	Description
inputPdf	fileupload required	Yes	—
markupsJson	textarea	Yes	—
highlightOpacity	number	No	—
noteOpacity	number	No	—
noteWidthRatio	number	No	—

File-type parameters must be uploaded first via POST /upload/pdf-comment-markup, then the returned filePath is passed to the corresponding file field.

Response format

File result

JSON

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-pdf-comment-markup": {
      "name": "pdf-comment-markup",
      "description": "Draw review-style side comments, arrows, and highlight regions on PDF pages",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=pdf-comment-markup",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "pdf-comment-markup",
    "arguments": {
  "inputPdf": "/Users/quyue/www/elysia-tools/public/samples/pdf/outline-bookmarks-example1.pdf",
  "markupsJson": "[{\"page\":1,\"kind\":\"highlight\",\"x\":14,\"y\":20,\"w\":45,\"h\":8,\"text\":\"Need stronger source\"},{\"page\":1,\"kind\":\"comment\",\"x\":20,\"y\":38,\"w\":34,\"h\":9,\"text\":\"Clarify this claim with data.\",\"side\":\"right\"}]",
  "highlightOpacity": 0.26,
  "noteOpacity": 0.95,
  "noteWidthRatio": 0.22
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

File parameters accept a public file URL only (https://…). Local paths, data: URIs, and Base64 strings are not supported.

Questions or issues? Contact [email protected]