• PROTECTED
  • VERIFIED
  • READY
  • REVIEW

How to watermark and sign pdfs with your AI

Connect Stirling PDF to your agent to handle document security. Once connected, you can apply watermarks or digital signatures through simple chat commands.

Ask AI about this page

Short answer

How can I watermark and sign PDFs using my AI?

You tell your AI which file to use and what text or signature to apply. The AI then uses Stirling PDF to execute the watermark or signature directly on the document. You'll get a secured file ready for distribution.

Document security outcomes

Secure document results

What happens after you give the command.

PROTECTED

Watermarked files

The AI applies your specific text across the document. This prevents unauthorized reuse of your sensitive files.

VERIFIED

Digitally signed PDFs

Your agent applies a digital signature to the file. This confirms the document's authenticity and origin.

READY

Finalized documents

The AI handles the technical execution of the security layers. You receive a finished PDF that meets your requirements.

REVIEW

Human verification

You must check the final PDF to ensure the watermark placement or signature looks correct. The AI performs the action, but you confirm the quality.

The workflow

What your AI does when the file arrives.

The AI acts as the operator for the Stirling PDF tools.

  1. Identify the file

    Your agent locates the specific PDF you want to modify within your connected environment.

    add_watermark

  2. Apply text watermarks

    The AI places custom text over the document to mark it as confidential or draft.

    add_watermark

  3. Execute digital signatures

    The agent uses your credentials to sign the document for legal or formal validity.

    cert_sign

  4. Deliver the result

    The AI completes the process and provides the updated, secured version of the file.

    add_watermarkcert_sign

Try it

Copy these to start.

Use these prompts to trigger the Stirling PDF tools.

Starting points

Replace the bracketed text with your actual file names or specific watermark wording.

Stirling PDF Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_ex3cIfED6ID0iEuNTGmKIKMGxP4UB2LSaslRsUJV/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — Stirling PDF capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "stirling-pdf-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_ex3cIfED6ID0iEuNTGmKIKMGxP4UB2LSaslRsUJV/mcp"
    }
  }
}
Copy into chat04

  • Add a 'CONFIDENTIAL' watermark to the invoice_2024.pdf file.

  • Apply a digital signature to the contract_final.pdf document.

  • Watermark the project_proposal.pdf with the text 'DRAFT ONLY'.

  • Sign the legal_agreement.pdf using my digital certificate.

  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Start here

Connect Stirling PDF once, then ask.

One click connects the MCP to your client. Your credentials stay encrypted and secure on our end.

Connect Stirling PDF to your AI

FAQ

How this task behaves

  • 01

    Can the AI edit the text inside my PDF?

    No. The AI can only add watermarks or digital signatures on top of the existing content.

  • 02

    Does the AI choose my digital signature for me?

    No. You must specify which signature or certificate to use in your prompt.

  • 03

    Can I change the color of the watermark?

    Yes, you can specify the color and style of the text watermark in your instructions.

  • 04

    Will the AI delete my original file?

    No. The AI performs the requested actions on the file, but it does not delete your source documents.

  • 05

    Can the AI sign a document without my permission?

    No. The AI only executes the signature when you explicitly command it to do so.

  • More questions about Stirling PDF? The Connector page answers them. See everything the Stirling PDF Connector can do

Connect Stirling PDF to Claude, Cursor, ChatGPT & more