How to Electronically Sign a PDF

Whether you are signing a lease agreement, a freelance contract, or tax documents, printing out a paper, signing it with a pen, and scanning it back into your computer is a thing of the past.

Learning how to electronically sign a PDF saves time, cuts down on paper waste, and takes less than two minutes once you know where to look.

In this guide, we’ll walk you through three simple ways to electronically sign a PDF:

1. The Free Method: Using Built-In Desktop Tools (Mac & Windows)
2. The Professional Method: Using Adobe Acrobat Reader
3. The Mobile Method: Signing on Your Smartphone (iPhone & Android)

Let’s jump right in.

Is an Electronic Signature Legally Binding?

Yes! In most countries—including the United States (under the ESIGN Act and UETA) and the European Union (under eIDAS)—electronic signatures are legally binding for the vast majority of personal and business transactions.

Note: Some high-level legal documents (like wills or court orders) may still require a physical, notarized wet signature depending on your local laws.

Method 1: Use Built-In Desktop Tools (No Downloads Required)

If you just need to add your signature quickly without downloading extra software, your computer already has the tools you need.

On Mac (Using Preview)

Macs come equipped with a powerful built-in app called Preview, which makes signing PDFs effortless.

1. Open your PDF in Preview (double-clicking the file usually opens it by default).
2. Click the Markup Toolbar button (it looks like a small pen icon near the top-right search bar).
3. Click the Sign icon.
4. Choose how to create your signature:
   • Trackpad: Draw your signature using your finger.
   • Camera: Sign a white piece of paper and hold it up to your Mac’s webcam.
   • iPhone/iPad: Draw your signature on your connected mobile device’s screen.
5. Click Done. Your signature is now saved!
6. Click on your saved signature to insert it into the document, drag it into place, and resize it as needed.
7. Press Command + S to save your PDF.

On Windows 11 (Using Microsoft Edge)

Windows users can use the default Microsoft Edge browser to draw a quick signature directly onto a document.

1. Right-click your PDF file.
2. Select Open with > Microsoft Edge.
3. Click the Draw icon (a pen symbol) in the top toolbar.
4. Select a color (black or blue is standard) and write your signature directly on the signature line using your mouse, trackpad, or stylus.
5. Click the Save icon in the top right to save the signed PDF.

Method 2: Use Adobe Acrobat Reader (Best for Standard PDFs)

Adobe Acrobat Reader is the global standard for managing PDFs. The free version includes a dedicated tool for adding signatures.

1. Download and open your document in the free Adobe Acrobat Reader.
2. Click Fill & Sign in the right-hand panel (or under the Tools tab at the top).
3. Click the Sign Yourself icon at the top toolbar, then select Add Signature.
4. Choose one of three options:
   • Type: Type your name and choose a script font style.
   • Draw: Draw your signature using your mouse or trackpad.
   • Image: Upload a photo of your hand-written signature on paper.
5. Click Apply.
6. Move your mouse to the signature line, click to place the signature, and adjust its size.
7. Go to File > Save As to save your signed PDF.

Pro Tip: Once you add a signature in Adobe Acrobat, it stays saved in the app so you can sign future documents with just one click!

Method 3: How to Electronically Sign a PDF on Mobile

Need to sign an urgent contract while on the go? You can do it straight from your phone.

On iPhone & iPad (Files App)

1. Open the PDF in the native Files app (or tap a PDF attachment directly in your email).
2. Tap the Markup icon (looks like a pen point inside a circle) in the top-right corner.
3. Tap the Plus (+) button at the bottom right.
4. Tap Signature.
5. Draw your signature with your finger and tap Done.
6. Position and resize the signature box over the document, then tap Done in the top left to save.

On Android (Adobe Fill & Sign / Google Drive)

1. Download the free Adobe Fill & Sign or Adobe Acrobat app from the Google Play Store.
2. Open the app and select your PDF file.
3. Tap the Fountain Pen icon at the bottom of the screen.
4. Tap Create Signature, draw your signature on the screen, and tap Done.
5. Tap anywhere on the PDF to insert your signature, adjust its position, and tap the checkmark to save.

FAQs About Electronic Signatures

What is the difference between an Electronic Signature and a Digital Signature?

While often used interchangeably, they are technically different:

• Electronic Signature (e-Signature): An electronic image of your signature placed on a document (like typing your name or drawing it on a screen).
• Digital Signature: An encrypted signature backed by a cryptographic certificate that verifies your identity and guarantees the document hasn’t been altered after signing.

Are my signatures saved securely?

Built-in tools like Mac Preview or Adobe Reader store your signatures locally on your password-protected device, ensuring your signature remains secure.

Summary Checklist

Method	Best For	Tool Needed
Mac Preview	Fast, high-quality signatures	Built-in macOS app
Microsoft Edge	Quick, simple signatures on Windows	Built-in Windows browser
Adobe Reader	Formal/frequent document signing	Free desktop software
iOS / Android	Signing on the go	Native Files app or Adobe app

Signing PDFs electronically is straightforward once you know the right built-in tools. Choose the method that best fits your device, save your signature for future use, and stop relying on your printer!