How to Sign a PDF
Add electronic signatures to PDF documents for free
⚡Quick Answer
Mac: Preview > Markup > Signature. iPhone: Markup > + > Signature. Windows: Adobe Reader > Fill & Sign. Online: smallpdf.com/sign-pdf.
Step-by-Step Guide
Sign on Mac (Preview)
Open PDF in Preview. Click markup icon > Signature > Create Signature (trackpad or camera). Click to place signature.
Sign on iPhone/iPad
Open PDF in Files or Mail. Tap markup (pen icon). Tap + > Signature. Draw with finger, place on document.
Sign Online (Free)
Use smallpdf.com/sign-pdf or DocuSign free tier. Upload PDF, draw or type signature, download signed document.
Sign on Windows
Open PDF in Edge browser (built-in). Click Draw > draw signature. Or use Adobe Reader: Fill & Sign > Sign > Add Signature.
Frequently Asked Questions
Are electronic signatures legally valid?
Yes, in most countries including US and EU. They're legally equivalent to handwritten signatures for most documents.
What's the difference between electronic and digital signatures?
Electronic = any electronic mark (drawing, typed name). Digital = cryptographically secure with certificates. Both are valid for most uses.
Can I create a signature from a photo?
Yes! Sign white paper, photograph it, crop, and upload as image. Many tools let you import signature images.