How to Sign a PDF on Mac (5 Free Methods)

Here's how to sign a PDF on Mac: Use the built-in Preview app—you don't need to download anything. Preview lets you create electronic signatures using your trackpad, camera, or iPhone, then place them on any PDF document.

Methods Overview

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Method 1: Preview (Recommended)

Preview is the best way to sign PDFs on Mac—it's built-in and powerful.

Creating Your Signature

Step 1: Open any PDF in Preview

Step 2: Access Signature tool

• Click Tools → Annotate → Signature → Manage Signatures
• Or click the Markup toolbar icon, then Signature

Step 3: Create signature

Choose your method:

Using Trackpad:

1. Click Trackpad tab
2. Click to start
3. Sign with finger
4. Press any key when done
5. Click Done

Using Camera:

1. Click Camera tab
2. Sign on white paper with black pen
3. Hold paper up to camera
4. Align signature with line
5. Preview captures it
6. Click Done

Using iPhone:

1. Click iPhone tab (iPhone must be nearby and signed into same Apple ID)
2. Sign on iPhone screen
3. Tap Done on iPhone
4. Signature appears on Mac

Signing a PDF

Step 1: Open PDF in Preview

• Double-click PDF (opens in Preview by default)
• Or right-click → Open With → Preview

Step 2: Add signature

1. Click Markup toolbar icon (or View → Show Markup Toolbar)
2. Click Signature icon
3. Select your saved signature

Step 3: Position and resize

1. Click where you want signature
2. Drag corners to resize
3. Drag to reposition

Step 4: Save

• File → Save
• Or Cmd + S

Managing Signatures

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Method 2: Quick Look

Sign without even opening an app.

Step-by-Step

1. Select PDF in Finder
2. Press Spacebar to Quick Look
3. Click Markup icon (pen in circle)
4. Click Signature icon
5. Select or create signature
6. Position on document
7. Click Done
8. Choose Save or Save as PDF

When to Use Quick Look

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Method 3: Adobe Acrobat Reader

Adobe's free reader also supports signatures.

Download and Install

1. Go to get.adobe.com/reader
2. Download free version
3. Install (skip optional offers)

Sign a PDF

1. Open PDF in Adobe Reader
2. Click Fill & Sign in right panel
3. Click Sign → Add Signature
4. Choose method:
   • Type: Type name, choose style
   • Draw: Draw with mouse
   • Image: Upload signature image
5. Click Apply
6. Click where you want signature
7. File → Save

Adobe vs Preview

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Method 4: Online Tools

Sign in your browser without installing anything.

Smallpdf

1. Go to smallpdf.com/sign-pdf
2. Upload your PDF
3. Click Add Signature
4. Draw, type, or upload
5. Place on document
6. Click Finish & Download

ILovePDF

1. Go to ilovepdf.com/sign-pdf
2. Upload PDF
3. Add signature
4. Download signed PDF

Online Tool Comparison

When to Use Online

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Method 5: E-Signature Platforms

For professional documents needing audit trails.

Options

When to Use E-Signature Platforms

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Creating High-Quality Signatures

Using Camera (Best Quality)

1. Sign on white paper with black Sharpie
2. Good lighting (no shadows)
3. Hold paper flat and steady
4. Fill the signature line on screen
5. Wait for auto-capture

Using Trackpad

Using iPhone

1. Ensure iPhone nearby
2. Signed into same Apple ID
3. Sign with finger or Apple Pencil
4. Tap Done on iPhone

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Adding More Than Signature

Adding Date

1. Open Markup toolbar
2. Click Text tool (A icon)
3. Click where you want date
4. Type the date
5. Adjust size and position

Adding Initials

1. Create new signature with just initials
2. Save separately
3. Use for initialing pages

Adding Checkmarks

1. Use Shapes tool
2. Select checkmark
3. Place where needed

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Troubleshooting

Common Issues

PDF is Protected

If you can't sign:

1. Check if PDF allows editing
2. Contact sender for editable version
3. Try Adobe Reader (more lenient)

Signature Quality Poor

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Keyboard Shortcuts

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Sharing Signed PDFs

Email

1. File → Share → Email
2. Or Cmd + Shift + I
3. Compose and send

AirDrop

1. File → Share → AirDrop
2. Select recipient

Messages

1. File → Share → Messages
2. Choose contact

Cloud Storage

1. Save to iCloud Drive, Dropbox, Google Drive
2. Share link with recipient

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Frequently Asked Questions

Does Preview save my signature?

Yes. Once created, signatures are saved and available in any PDF you open in Preview.

Can I have multiple signatures?

Yes. Create different signatures (full name, initials, formal) and switch between them.

Is Preview signature legally binding?

Yes, for most documents. For contracts with others, consider e-signature platforms for audit trails.

Can I sign Word documents in Preview?

No. Convert to PDF first (File → Export as PDF in Word), then sign.

Does this work on older Macs?

Preview signatures work on macOS 10.7 Lion and later. iPhone signing requires macOS 10.15 Catalina or later.

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Summary

Quick steps for Preview:

1. Open PDF in Preview
2. Tools → Annotate → Signature
3. Create or select signature
4. Click to place
5. Save

Related guides:

• How to sign a PDF →
• Sign PDF without printing →
• Make transparent signature →

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Last updated: January 28, 2026