How to Sign a PDF Electronically — Free Methods for 2026

Signing PDF documents electronically saves time, paper, and hassle. No more printing, signing by hand, and scanning back in. Whether you are signing a contract, a tax form, or a permission slip, you can do it all from your computer or phone — for free. Here is how to sign PDFs electronically in 2026.

Are Electronic Signatures Legal?

Yes. Electronic signatures are legally binding in most countries. In the United States, the ESIGN Act and UETA establish that electronic signatures carry the same legal weight as handwritten ones. The EU's eIDAS regulation does the same for Europe. For most everyday documents — contracts, agreements, forms — a simple electronic signature is sufficient. Some contexts like notarized documents or certain government filings may require a qualified digital signature with a certificate, but that covers a small fraction of what most people sign.

Method 1: PeacefulPDF (Free, Browser-Based)

PeacefulPDF lets you sign PDFs directly in your browser. No account, no software download, and your files never leave your device. Everything is processed locally:

1. Open PeacefulPDF and load your PDF document
2. Click the "Sign" tool in the toolbar
3. Choose to draw your signature, type it, or upload an image
4. Place the signature on the document where needed
5. Resize and position it to fit the signature line
6. Download the signed PDF

This is the fastest method for most people. The privacy advantage matters too — your contracts and legal documents are not being uploaded to a third-party server.

Method 2: Mac Preview (Built-In for Mac Users)

If you use a Mac, you already have a capable PDF signing tool built in:

1. Open the PDF in Preview
2. Click the "Show Markup Toolbar" button
3. Click the "Sign" icon
4. Create a signature using your trackpad, camera, or iPhone
5. Click the signature to add it to the document
6. Drag it to the correct position and resize
7. Save the document (File → Save)

Preview stores your signature so you can reuse it on future documents. The trackpad drawing option is surprisingly good if you have a steady hand.

Method 3: Adobe Acrobat Reader (Free Version)

Adobe Acrobat Reader has a free "Fill & Sign" feature:

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

Adobe also offers a paid tier with more features, but the free version handles basic signing just fine. Adobe does process your document through their servers, so keep that in mind for sensitive documents.

Method 4: Signing on iPhone and Android

You can sign PDFs on your phone without installing any extra apps:

• iPhone — Open the PDF in the Files app or Mail, tap the markup button, tap the "+" icon, and select "Signature." Sign with your finger or Apple Pencil. See our full guide on how to sign PDF on iPhone.
• Android — Open the PDF in Google Drive, tap the edit icon, then tap "Fill & Sign" to add your signature.

Types of Electronic Signatures

Not all electronic signatures are the same. Understanding the differences helps you pick the right approach:

• Simple Electronic Signature (SES) — A drawn, typed, or uploaded image of your signature. Legally valid for most documents. This is what most people use.
• Advanced Electronic Signature (AES) — Linked to the signer through a digital certificate. Provides stronger proof of identity. Requires a certificate authority.
• Qualified Electronic Signature (QES) — The highest level, backed by a qualified certificate and created with a secure signature creation device. Required for some government and financial documents in the EU.

For contracts, agreements, and everyday documents, a simple electronic signature is all you need. You can learn more about the legal side in our PDF digital signature guide.

Tips for Better Electronic Signatures

• Use a consistent signature — Save your signature as an image file so you use the same one every time. This looks more professional and is easier to verify.
• Size it correctly — Your signature should fit naturally on the signature line. Too small looks odd, too large covers other content.
• Date your signatures — Add a date next to or below your signature for clarity.
• Lock the document after signing — To prevent changes after signing, use password protection to lock the PDF.
• Keep a copy — Always save a copy of the signed document for your records before sending it.

Before Signing: Clean Your Document

Before you sign and share a PDF, make sure it does not contain hidden information you do not want to share. Use a PDF redaction tool to remove sensitive data and edit the metadata to strip out personal information like your name, software used, and file paths.

When You Need Multiple Signatures

For documents that need signatures from multiple people, you have two options. First, sign your portion, then send the signed file to the next person. Each person adds their signature in sequence. Second, use a signing platform like DocuSign or HelloSign (both have free tiers) that manages the signing order and notifies each person when it is their turn. For simple two-party agreements, the manual approach works fine. For complex multi-party contracts with deadlines, a signing platform is worth it.

The Bottom Line

Signing PDFs electronically is free, legal, and takes seconds. PeacefulPDF handles it in your browser without uploading your documents anywhere. Mac Preview and Adobe Reader are solid alternatives. Pick the method that fits your device and privacy needs, and stop printing documents just to sign them.