How to Sign a PDF Online (Free, No Printing)

To sign a PDF without printing, open it in a free tool such as Adobe Acrobat Reader (Fill & Sign), Apple Preview on Mac or Markup on iPhone and iPad, draw, type or upload your signature, place it on the document and save. To collect signatures from other people with a proper audit trail, upload the PDF to an e-signature tool, add signature fields and send a signing link.

Sign a PDF on Windows with Adobe Acrobat Reader

1. Open the PDF in free Adobe Acrobat Reader.
2. Select Fill & Sign (or the sign tool in newer versions).
3. Choose Add signature.
4. Type, draw or upload an image of your signature.
5. Click where you want to place it and resize as needed.
6. Save the signed PDF.

Menu names can change between versions; check Adobe’s help if they differ.

Sign a PDF on Mac with Preview

1. Open the PDF in Preview.
2. Click the Markup toolbar icon, then the Sign button.
3. Create a signature using your trackpad, camera or iPhone.
4. Select the signature and drag it into place.
5. Save the file.

Sign a PDF on iPhone or iPad

1. Open the PDF in Files or Mail.
2. Tap the Markup icon.
3. Tap the + button and choose Signature.
4. Draw or select your signature and position it.
5. Tap Done and save or send.

Sign a PDF on Android

Use the Adobe Acrobat Reader mobile app or another trusted PDF app:

1. Open the PDF in the app.
2. Select the fill and sign option.
3. Create your signature and place it.
4. Save or share the file.

Sign a PDF in a browser

Many e-signature and PDF websites let you upload and sign a PDF online. Before using one, check:

• The site is reputable and uses HTTPS.
• Its privacy policy explains how files are stored and deleted.
• You are comfortable uploading the document’s contents.

Signing vs requesting signatures

Is a signature added to a PDF legally binding?

In the US, electronic signatures are generally valid under the ESIGN Act and state UETA laws when the signer intends to sign and consents to electronic records. Pasting a signature image is a form of electronic signature, but evidence of who signed and when is weaker than with an e-signature platform that records an audit trail.

Tips

• Save a copy of the original before signing.
• Flatten or lock the PDF after signing if your tool supports it.
• Avoid emailing sensitive signed documents without encryption.
• For contracts, use an e-signature tool with an audit trail.

How Noca helps

Noca lets you send documents for legally binding e-signature with full audit trails, or generate documents automatically from forms and CRM data before signing. Explore Noca e-signature or read how to send a document for e-signature.

Related guides

• How to Collect Signatures on a Google Form
• How to Create a Fillable PDF (Free, 4 Ways)

Frequently Asked Questions

How do I sign a PDF for free?

Use Adobe Acrobat Reader’s Fill & Sign tool on Windows or Android, Preview on Mac or Markup on iPhone and iPad. Create a typed, drawn or uploaded signature, place it on the PDF and save. These tools are free for signing your own documents.

How do I electronically sign a PDF without printing it?

Open the PDF in a tool like Acrobat Reader, Preview or Markup, add your signature digitally and save the file. No printing or scanning is needed. To collect signatures from others, use an e-signature service that sends a secure signing link.

Why can’t I sign a PDF?

Common reasons include a password-protected or locked PDF, a PDF that has already been certified, an outdated app or a browser viewer that does not support signing. Try opening the file in Adobe Acrobat Reader or another PDF app and check whether editing is restricted.

Is a PDF signature legally binding?

Electronic signatures on PDFs are generally legally binding in the US under the ESIGN Act and UETA, provided the signer intends to sign. For important agreements, use an e-signature platform that records an audit trail to provide stronger evidence of who signed and when.

What is the difference between an electronic and a digital signature on a PDF?

An electronic signature is any electronic indication of intent to sign, such as a typed or drawn signature. A digital signature is a specific type that uses a certificate and cryptography to verify the signer’s identity and detect changes to the document.

How do I get someone else to sign a PDF?

Upload the PDF to an e-signature tool, add signature and date fields for each signer, enter their email addresses and send. Signers receive a link to sign on any device, and you receive the completed PDF with an audit trail.