How to Digitally Sign a PDF for Free (Step-by-Step)

What Does It Mean to "Digitally Sign" a PDF?

Before we get into the how-to, let's clarify something that confuses many people: "digital signature" and "electronic signature" are not the same thing, even though people use the terms interchangeably.

• Electronic signature (e-signature): Any electronic indication of intent to sign — a drawn signature, typed name, or clicked "I agree" button. This is what most people need.

• Digital signature: A specific type of electronic signature that uses cryptographic encryption (PKI) to verify the signer's identity and ensure the document hasn't been tampered with.

For most everyday documents — contracts, agreements, forms, leases — an electronic signature is sufficient and legally valid. You only need a cryptographic digital signature for specific regulated industries or government filings.

This guide shows you how to add an electronic signature to a PDF, which is what 99% of people mean when they say "digitally sign a PDF."

Step-by-Step: Sign a PDF in 60 Seconds

Step 1: Open SigPDF

Go to sigpdf.com in any web browser. No download or account creation needed.

Step 2: Upload Your PDF

Drag and drop your PDF file onto the upload area, or click "Choose File" to browse. Your file is processed entirely in your browser — it never leaves your device.

Step 3: Create Your Signature

Click "Add Signature" in the toolbar. You have two options:

• Draw: Use your mouse, trackpad, or finger (on touch devices) to draw your signature freehand. Choose black, blue, or red ink.
• Type: Type your name and select from several handwriting-style fonts for a clean, consistent look.

Step 4: Place Your Signature

Click anywhere on the PDF page where you want your signature to appear. You can:

• Drag to reposition
• Resize by dragging the corners
• Place signatures on multiple pages
• Add multiple signatures to the same page

Step 5: Add Supporting Elements (Optional)

Use the additional tools to complete the document:

• Add Text — Type your name, date, title, or any other text
• Add Date — Insert today's date with one click
• Add Photo — Upload an ID photo or company stamp

Step 6: Download

Click "Confirm & Download" to get your signed PDF. The signature is permanently embedded in the document — it cannot be moved or removed by the recipient.

Tips for a Professional-Looking Signature

1. Use a consistent signature — Sign the same way every time for a professional appearance.

2. Choose the right color — Black is standard for most documents. Blue is traditional for original copies (it visually distinguishes an original from a photocopy). Red is used for stamps or corrections.

3. Size it appropriately — Your signature should fit naturally in the signature line area. Don't make it too large or too small.

4. Position it precisely — Place your signature directly on or above the signature line, just as you would on paper.

5. Add a date — Most signed documents need a date next to the signature. Use the "Add Date" tool for consistency.

Is a Free Electronic Signature Legally Valid?

Yes. In most countries, electronic signatures carry the same legal weight as handwritten signatures for the vast majority of documents:

• US: The ESIGN Act (2000) and UETA make electronic signatures legally binding for most transactions.
• EU: The eIDAS Regulation recognizes electronic signatures across all EU member states.
• UK: The Electronic Communications Act 2000 validates electronic signatures.

Exceptions where you may need a higher level of signature (qualified electronic signature or notarization):

• Real estate transfers (varies by jurisdiction)
• Wills and testaments
• Court filings
• Certain government forms
• Powers of attorney (in some jurisdictions)

For everything else — employment contracts, NDAs, freelance agreements, rental leases, invoices, purchase orders — a simple electronic signature is legally sufficient.

Common Questions

Can the recipient tell it's an electronic signature?

The signature is embedded directly into the PDF as a visual element. It looks like a regular signature when the document is viewed or printed. There's no special "electronic" marking.

Can someone remove or alter my signature after I send it?

The signature is flattened into the PDF as part of the document content. It cannot be moved, edited, or removed using standard PDF viewers. However, note that this is a visual signature, not a cryptographically sealed one — someone with advanced PDF editing tools could theoretically modify the document.

Do I need to sign every page?

This depends on the document and jurisdiction. For most contracts, signing the final page (signature page) is sufficient. Some legal documents require initials on every page. When in doubt, follow the instructions on the document or ask the requesting party.

Can I reuse my signature?

With SigPDF, you create a new signature each time. This is actually better for security — each signature is slightly unique, just like signing on paper. If you want consistency, use the "Type" option which produces the same result every time.

Sign Your First PDF Now

Ready to sign a document? Go to SigPDF and have your signed PDF in under 60 seconds. No account, no installation, no hassle.