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Sign PDF (Handwritten Signatures)

Tool ID: sign

Add handwritten signatures, text signatures, or image-based signatures to PDF documents. This tool is for visual/handwritten signatures - for certificate-based digital signatures, see Certificate Signing.

Signature Methods​

  1. Upload PDF and navigate to the signing location
  2. Click "Draw Signature" to open the signature pad
  3. Draw using mouse or touchscreen
  4. Position and resize the signature on the page
  5. Apply and download

A touchscreen or stylus gives the best results.

Pre-stored Signatures​

Configure Stirling PDF to load pre-stored signature files for quick, consistent signing across documents.

Configuration: Sign with Custom Files

Signature Options​

  • Transparency - Make signature background transparent
  • Color - Blue, black, or custom ink color
  • Size - Adjust to fit signature line
  • Rotation - Adjust angle if needed
  • Pages - Sign on single page, multiple pages, or different signatures per page

Visual vs. Digital Signatures​

Visual Signature (This Tool)Digital Signature (Certificate)
SecurityVisual only, can be copiedCryptographically secure
AuthenticationNo verificationProves signer identity
Tamper DetectionNoneDetects changes after signing
SetupNone requiredRequires certificate

Visual signatures do not provide authentication, tamper protection, or guaranteed legal standing. For legally binding signatures requiring verification, use Certificate Signing.