How to Sign a PDF Electronically: Free Methods for 2026

You get a contract by email. It is a PDF. They want your signature. The old way: print it, sign it, scan it, email it back. The whole process takes 15 minutes and requires a printer you probably do not own anymore.

The new way: sign it electronically in under 60 seconds. No paper, no scanner, no software to install. Here is exactly how to do it on every device and platform.

What Counts as an Electronic Signature?

An electronic signature is any electronic indication of intent to sign a document. This includes typed names, drawn signatures, uploaded images of your handwritten signature, and click-to-sign confirmations. In most countries — including the US (ESIGN Act), UK, EU (eIDAS), and Australia — electronic signatures are legally binding for most documents.

A digital signature is a specific type of electronic signature that uses cryptographic authentication. It is more secure but rarely needed for everyday documents like contracts, NDAs, and agreements. The methods below cover standard electronic signatures, which are sufficient for 99% of situations.

Method 1: Mac Preview (Built-in, Free)

If you use a Mac, you already have everything you need. Preview, the default PDF viewer, includes a signature tool.

Steps:

1. Open the PDF in Preview (double-click it)
2. Click the Markup toolbar button (pen icon) or press Shift + Command + A
3. Click the Sign button (signature icon)
4. Choose "Trackpad" to draw with your finger or "Camera" to sign on paper and hold it up to your webcam
5. Click Done, then click on the signature to place it on the document
6. Drag to position and resize as needed
7. Save the document (Command + S)

Preview saves your signature for future use. Next time, just click Sign and select your saved signature. The trackpad option works surprisingly well — better than most people expect.

Method 2: iPhone and iPad (Markup Tool)

iOS has a built-in signature tool that works in Mail, Files, and any app that supports PDF markup.

From Mail:

1. Open the email with the PDF attachment
2. Tap the attachment to view it
3. Tap the Markup button (pen tip icon) in the top right
4. Tap the + button, then tap Signature
5. Sign with your finger or Apple Pencil
6. Tap Done, then drag the signature into position
7. Tap Done, then Reply All to send it back

From Files: Open the PDF in Files, tap the Markup icon, and follow the same steps. Your saved signatures sync across devices via iCloud.

Method 3: Android (Google Drive)

Android does not have a built-in signature tool, but Google Drive fills the gap.

1. Open the Google Drive app
2. Find and open the PDF
3. Tap the three-dot menu, then "Open with" > "Google Docs"
4. For signing, use the free Adobe Fill & Sign app instead — it works better for signatures specifically

Adobe Fill & Sign is free and purpose-built for this. Draw your signature once, save it, and stamp it on any PDF. It also handles initials, dates, and text fields.

Method 4: Free Online Tools

No matter what device you are on, web-based signing tools work in any browser. No installation needed.

Best free options:

• DocuSign Free: Up to 3 documents per month. Upload, place signature, send. The gold standard for e-signatures.
• HelloSign (Dropbox): 3 free documents per month. Clean interface, easy to use.
• SignWell: 3 free documents per month with templates and audit trail.
• SmallPDF eSign: Upload, draw or type your signature, download. Simple and fast.

For one-off documents, any of these work. If you sign documents regularly, the 3-per-month limits on free tiers will get annoying fast. In that case, Mac Preview or the built-in mobile tools are better long-term solutions.

Method 5: Adobe Acrobat Reader (Free Tier)

Adobe Acrobat Reader DC is free and includes a "Fill & Sign" tool. It is available for Windows, Mac, iOS, and Android.

1. Open the PDF in Adobe Acrobat Reader
2. Click "Fill & Sign" in the right panel
3. Click "Sign Yourself"
4. Choose to type, draw, or upload an image of your signature
5. Place it on the document, resize, and save

The free tier handles basic signing well. Adobe pushes their paid Pro version aggressively, but for signing alone, the free version does everything you need.

How to Create a Clean Signature Image

If you want to upload a handwritten signature, the quality of the image matters. A bad signature image looks unprofessional. Here is how to make a good one:

1. Use black ink on plain white paper
2. Sign larger than normal — about 3 inches wide
3. Take a photo in good lighting, directly overhead
4. Crop tightly around the signature
5. Use a background remover tool to make the white transparent

Most signing tools handle background removal automatically. If yours does not, remove.bg or similar free tools do it in one click.

Are Electronic Signatures Legal?

Yes, in most situations. Here is the quick breakdown:

• United States: ESIGN Act (2000) makes electronic signatures legally valid for most documents. Exceptions: wills, court orders, eviction notices, and some real estate documents in certain states.
• European Union: eIDAS regulation recognizes electronic signatures as valid across all member states.
• United Kingdom: Electronic Signatures Regulations 2002, aligned with eIDAS post-Brexit.
• Australia: Electronic Transactions Act 1999 covers most business documents.

For high-value contracts or legal proceedings, some jurisdictions may require a witnessed or notarized signature. Check with your lawyer for those edge cases.

Tips for Professional-Looking Signatures

• Use a consistent signature across all documents — do not switch between typed and drawn
• Size it proportionally to the signature line — not too big, not too small
• Add the date next to or below your signature
• If the document has a signature field, place your signature inside it
• Save a copy before signing in case you need to make changes later