Sign PDF
Add your signature to a PDF document.
Drop a PDF file here or click to select
Max file size: 10.00 MB
How to Sign a PDF Online
- Upload the PDF document you need to sign
- Draw your signature on the canvas using mouse or touch
- Set the page number and position for your signature
- Click "Sign PDF" and download the signed document
Why Sign a PDF Online?
Printing a PDF just to sign it and scan it back is a waste of time and paper. Our online signature tool lets you draw your signature directly on the document and download a signed copy in seconds - from any device.
- No printing, scanning, or mailing required
- Draw your signature naturally with mouse or touchscreen
- Place your signature on any page at any position
- Electronic signatures are legally recognized in most jurisdictions
- Works on phone, tablet, and desktop
Features & Benefits
- Draw Signature: Use your mouse, trackpad, or touchscreen to sign naturally.
- Custom Placement: Set exact page, X and Y position for your signature.
- Clear & Redraw: Not happy? Clear the canvas and try again.
- Legally Valid: Electronic signatures are accepted under eIDAS (EU) and ESIGN Act (US).
- Free: Sign PDFs at no cost, no account needed.
- Mobile Friendly: Use your finger to sign on phone or tablet.
Frequently Asked Questions
How do I sign a PDF for free?
Upload your PDF, draw your signature, set the placement, click Sign PDF. Download instantly - free.
Is an electronic signature legally valid?
Yes, in most countries under laws like eIDAS (EU) and ESIGN Act (US). Check your jurisdiction for formal contracts.
Can I sign on my phone?
Yes. Use your finger to draw on the touch canvas. Works on iPhone and Android.
Do I need Acrobat to sign a PDF?
No. Pdiffy lets you sign any PDF in your browser - no software, no account.