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PDF Comment Markup

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

Apply markup overlays to an existing PDF.

Includes:

  • Highlight boxes for review focus
  • Side comment boxes with connector arrows
  • Left/right note placement for editorial workflows

Example Results

2 examples

Right-Side Review Notes

Adds highlight and right-side comment callout to a draft PDF

comment-markup-example1.pdf View File
View input parameters
{ "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 }

Left-Side Editorial Notes

Uses left-side note placement and lower highlight opacity

comment-markup-example2.pdf View File
View input parameters
{ "inputPdf": "/Users/quyue/www/elysia-tools/public/samples/pdf/outline-bookmarks-example2.pdf", "markupsJson": "[{\"page\":1,\"kind\":\"comment\",\"x\":16,\"y\":30,\"w\":26,\"h\":8,\"text\":\"Move this paragraph under Architecture.\",\"side\":\"left\"},{\"page\":1,\"kind\":\"highlight\",\"x\":18,\"y\":52,\"w\":38,\"h\":10}]", "highlightOpacity": 0.18, "noteOpacity": 0.86, "noteWidthRatio": 0.28 }

Click to upload file or drag and drop file here

Maximum file size: 120MB Supported formats: application/pdf

Key Facts

Category
Document Tools
Input Types
file, textarea, number
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

Apply markup overlays to an existing PDF. **Includes:** - Highlight boxes for review focus - Side comment boxes with connector arrows - Left/right note placement for editorial workflows

When to Use

  • •Use it when you need to process json, pdf content quickly in the browser.
  • •Helpful for document tools workflows that need repeatable inputs and fast results.
  • •A good fit when you want to test with real files before running the same workflow in code or API calls.

How It Works

  • •Provide Input PDF, Markups JSON, Highlight Opacity, Note Box Opacity as input to the tool.
  • •The tool processes the request and returns a file result.
  • •For file workflows, start with representative samples such as json, pdf test files to verify edge cases and output quality.

Use Cases

Process json, pdf data during debugging or QA.
Validate expected output before using the API or automation flows.
Test the workflow with representative sample files and edge cases.

Try with Samples

json, pdf, file
PDF Samples
Generated PDF samples from tools dated 2026-02-01 to 2026-02-10
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FAQ

What does PDF Comment Markup do?

PDF Comment Markup helps you process json, pdf content online without setting up a separate local script or app.

When should I use this tool?

Use it when you need a quick process workflow, want to verify output, or need a browser-based utility for document tools tasks.

Can I try this tool with sample data?

Yes. This page can recommend related sample files so you can test the workflow immediately.

What inputs does PDF Comment Markup accept?

PDF Comment Markup accepts Input PDF, Markups JSON, Highlight Opacity, Note Box Opacity and supports file uploads for 1 field.

Is there an API for PDF Comment Markup?

Yes. The tool page includes an API endpoint so you can move from manual testing to scripted usage.

API Documentation

Request Endpoint

POST /en/api/tools/pdf-comment-markup

Request Parameters

Parameter Name Type Required Description
inputPdf file (Upload required) Yes -
markupsJson textarea Yes -
highlightOpacity number No -
noteOpacity number No -
noteWidthRatio number No -

File type parameters need to be uploaded first via POST /upload/pdf-comment-markup to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "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)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

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

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]