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Sign PDF (Handwritten Signatures)

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. Select the "Draw" tab to open the signature canvas
  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 - Remove the white background of an uploaded signature image to make it transparent
  • Color - Pick any ink color from the color picker (with quick black, blue, red, orange, green, and purple swatches) for drawn and typed signatures
  • Size - Adjust the pen thickness and resize the placed signature to fit the signature line
  • Pages - Sign on a single page, or place signatures on multiple pages

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.

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