# KDAN PDF MCP server

Upload, edit, compress, protect, redact, and compare PDFs with KDAN PDF in Claude and ChatGPT.

## Links
- Registry page: https://www.getdrio.com/mcp/com-kdandoc-mcp-kdan-pdf-mcp
- Repository: https://github.com/KDAN-PDF/KDAN-PDF-MCP
- Website: https://pdf-reader.kdandoc.com/products/mcp/claude

## Install
- Endpoint: https://mcp.kdandoc.com/mcp
- Auth: Not captured

## Setup notes
- Remote endpoint: https://mcp.kdandoc.com/mcp

## Tools
- compare_pdfs (Compare PDFs) - MANDATORY for all document comparison requests. Compare two PDFs side-by-side.

When the user asks to compare, diff, or find differences between two PDFs, you MUST
call this tool — NEVER attempt to compare documents using text analysis.
Displays an interactive side-by-side visual diff widget with colored highlights:
red = deleted, yellow = replaced, green = inserted.
The widget IS the comparison result — do NOT re-summarize the differences after calling.

Before calling, confirm both job_ids exist via check_upload_status. Endpoint: https://mcp.kdandoc.com/mcp
- compress_pdf (Compress PDF) - Compress a PDF to reduce its file size and return a new versioned file.

MANDATORY: Before calling this tool, call 'check_upload_status' with the
session_id to confirm the file exists and retrieve the latest job_id.
Skipping this check and calling compress_pdf directly is FORBIDDEN.

Each call creates a NEW job_id (with parent_job_id linking to the source).
The original PDF version is preserved unchanged — previous versions remain accessible.
After compression completes, call 'view_pdf' with the new job_id to display the result. Endpoint: https://mcp.kdandoc.com/mcp
- delete_pdf_page (Delete PDF Pages) - Delete one or more pages from a PDF and return a new versioned file.

MANDATORY: Before calling this tool, call 'check_upload_status' with the
session_id to confirm the file exists and retrieve the latest job_id.
Skipping this check and calling delete_pdf_page directly is FORBIDDEN.

Each call creates a NEW job_id (with parent_job_id linking to the source).
The original PDF version is preserved unchanged — previous versions remain accessible.
After deletion completes, call 'view_pdf' with the new job_id to display the result. Endpoint: https://mcp.kdandoc.com/mcp
- set_password (Set PDF Password) - Add password protection to an unprotected PDF file.

Creates a NEW job_id (with parent_job_id linking to the source). After the operation
completes, call 'view_pdf' with the new job_id to display the result. Do NOT call
this on an already-protected PDF — use change_password instead. Endpoint: https://mcp.kdandoc.com/mcp
- change_password (Change PDF Password) - Change the password of an already-protected PDF file.

Creates a NEW job_id (with parent_job_id linking to the source). After the operation
completes, call 'view_pdf' with the new job_id to display the result. Do NOT call
this on an unprotected PDF — use set_password instead. Endpoint: https://mcp.kdandoc.com/mcp
- list_redactable_line_text (List Redactable Text Lines) - Return per-page, per-line text for identifying redaction targets.

Read-only: does not modify job state. ALWAYS call this before redact_by_text_range.
The returned 'text' field for each line is the source of truth — you MUST use it
to count exact character positions. Character positions within each line are 0-based
from the start of that line. Endpoint: https://mcp.kdandoc.com/mcp
- redact_by_text_range (Redact PDF Text) - Redact PDF text by specifying the exact text to remove on each line.

MANDATORY WORKFLOW — follow every step in order before calling this tool:

Step 1 — Retrieve line text:
    Call list_redactable_line_text and note the exact 'text' string
    and 'line_index' for every line you intend to redact.

Step 2 — Identify the text to redact:
    Provide the exact substring to remove. The value must appear verbatim
    in the line's 'text' field.
    - Non-CJK text (e.g. English): whole-word matching is enforced.
      "the" will NOT redact text inside "then", "there", or "either".
    - CJK text (e.g. Chinese): substring matching — "王大明" will match
      wherever it appears in the line.

Step 3 — Build the content payload:
    Group redaction targets by page. Each page entry contains a list of
    { line_index, text } pairs.

    Example:
        content = [
            {
                "page_index": 1,
                "lines": [
                    {"line_index": 3, "text": "John Doe"},
                    {"line_index": 7, "text": "confidential"}
                ]
            }
        ]

Step 4 — Verify and re-redact if needed:
    After this tool returns, you MUST call list_redactable_line_text again
    with the NEW job_id to verify that all intended targets have been removed.
    If any target text still appears in the result, call redact_by_text_range
    again immediately with the remaining targets. Repeat until all targets
    are gone — do NOT report success until the verification confirms zero
    remaining targets.

Creates a NEW job_id (with parent_job_id linking to the source). After redaction
completes, call 'view_pdf' with the new job_id to display the result. Endpoint: https://mcp.kdandoc.com/mcp
- upload_pdf (Upload PDF) - Upload a PDF from a ChatGPT file attachment (download URL).

MANDATORY WORKFLOW — follow EVERY step in order:
1. ALWAYS call check_upload_status FIRST — even if you think the file is new.
2. If a job with the same filename already exists, reuse its job_id — do NOT call upload_pdf.
3. Only call upload_pdf if the file is confirmed absent from check_upload_status.
Skipping step 1 and calling upload_pdf directly is FORBIDDEN.

Use this when the user provides a file attachment in ChatGPT. The tool downloads
the PDF from the signed URL in the pdf_file parameter and stores it immediately.
Returns session_id and job_id for use in all subsequent tool calls.

For MCP clients where no file attachment is available (e.g. Claude), use
create_upload_page instead to display an upload widget. Endpoint: https://mcp.kdandoc.com/mcp
- batch_upload_pdf (Batch Upload PDFs) - Upload multiple PDF files from ChatGPT file attachments (download URLs).

Use this when the user provides multiple file attachments in ChatGPT.
Downloads each PDF from its signed URL and stores it.
Returns session_id and a list of job_ids.

MANDATORY WORKFLOW before calling this tool:
1. ALWAYS call check_upload_status FIRST — even if you think the files are new.
2. Only include files confirmed absent from check_upload_status. If ALL files are already
   uploaded, skip batch_upload_pdf entirely and reuse the existing job_ids.
3. Reuse job_ids from already_uploaded — do NOT re-upload those files.
Skipping step 1 and calling batch_upload_pdf directly is FORBIDDEN.

After batch_upload_pdf completes: if the user requested a comparison, call
'compare_pdfs' with the returned job_ids immediately. Endpoint: https://mcp.kdandoc.com/mcp
- create_upload_page (Create PDF Upload Page) - Display an interactive PDF upload widget directly in the chat.

Use this when the user wants to upload a local PDF file from their device.
This is the standard upload method for MCP clients (e.g. Claude) where
file attachments with download URLs are not available.

Do NOT call upload_pdf when using this tool — the widget handles the upload automatically.
The widget renders inline and the PDF viewer appears after the user selects a file.
Do NOT call view_pdf after this tool; the widget manages the UI.
Never tell the user the file is still uploading; the widget handles the spinner.

After the user uploads via the widget and notifies you, call
check_upload_status(session_id=<session_id>) to discover the uploaded file
and its job_id before proceeding with any operation. Endpoint: https://mcp.kdandoc.com/mcp
- check_upload_status (Check Upload Status) - Check existing uploads and determine which files still need uploading.

Call this BEFORE upload_pdf or create_upload_page to avoid duplicate uploads.
Also call it after the user uploads via the widget to discover the new file
and its job_id.

Returns 'session_id' (always — store it!), plus:
- 'already_uploaded': files found in this session with reusable job_ids
- 'needs_upload': files not yet in this session (must be uploaded)

You MUST call this tool before any upload, and you MUST act on its result immediately:
- 'needs_upload' is non-empty → call upload_pdf (single) or batch_upload_pdf (multiple)
  with ONLY the files listed in 'needs_upload'. Pass the same session_id.
  Do NOT upload files in 'already_uploaded'.
- 'needs_upload' is empty → skip uploading entirely; use the job_ids from 'already_uploaded'.

When pending_filenames is omitted, returns all jobs currently in the session. Endpoint: https://mcp.kdandoc.com/mcp
- view_pdf (View PDF) - Display an already-uploaded PDF in an interactive viewer widget.

Call this after delete_pdf_page, set_password, change_password, redact_pii, and
redact_by_text_range to show the updated PDF. Also call when the user explicitly
asks to (re-)display a specific PDF.
Do NOT call this after upload_pdf (the widget handles it automatically).
Before calling, confirm the job_id exists via check_upload_status.

MANDATORY after this tool returns:
1. Render a markdown download link so the user can save the file:
   [Download {filename}]({download_url})
2. Follow cta_instruction and append cta_text at the end of your reply. Endpoint: https://mcp.kdandoc.com/mcp
- get_pdf_status (Get PDF Status) - Return current status of a PDF viewer job. Used internally by the viewer widget. Endpoint: https://mcp.kdandoc.com/mcp
- get_pdf_info (Get PDF Info) - Use this when you need to read the text content of each page to decide which pages to delete. Returns page count and a text preview of every page. Use for text-based identification: table of contents, blank pages, cover page, etc. For visual content (logos, images, photos), use get_pdf_page_images instead. Endpoint: https://mcp.kdandoc.com/mcp
- get_pdf_page_images (Get PDF Page Images) - Use this when you need to visually inspect PDF pages to identify content that cannot be detected from text alone — for example, pages containing a logo, a photograph, a watermark, a QR code, or any visual element. Returns rendered JPEG screenshots as images you can see. Returns at most 10 pages per call. ALWAYS start from start_page=1 and paginate through the ENTIRE document: check 'has_more' in structuredContent — if true, call again with start_page=next_start_page. Repeat until has_more is false. You must finish scanning all pages before answering the user's question or performing any action (e.g. deletion). Requires: pip install pymupdf Endpoint: https://mcp.kdandoc.com/mcp

## Resources
- ui://widget/pdf-compare-viewer.html - 回傳 PDF Compare Widget 的 HTML 內容。 MIME type: text/html;profile=mcp-app
- ui://widget/pdf-upload-widget.html - 回傳 PDF Upload Widget 的 HTML 內容。 MIME type: text/html;profile=mcp-app
- ui://widget/pdf-mcp-viewer.html - 回傳 PDF Viewer Widget 的 HTML 內容。 MIME type: text/html;profile=mcp-app

## Prompts
Not captured

## Metadata
- Owner: com.kdandoc.mcp
- Version: 1.0.0
- Runtime: Streamable Http
- Transports: HTTP
- License: Not captured
- Language: Not captured
- Stars: Not captured
- Updated: Jul 28, 2026
- Source: https://registry.modelcontextprotocol.io