Sign PDF Online: Free Digital Signature Tool
Add your handwritten signature to any PDF document instantly — 100% private, no uploads, all in your browser.
Signing documents digitally has never been easier. Our PDF signature tool allows you to draw your signature directly in your browser and place it anywhere on your PDF document. Whether you need to sign contracts, agreements, or forms, this tool provides a simple, secure solution. Create your signature with mouse or touch, adjust its size and position, and download the signed PDF instantly. The entire process happens locally — no files are uploaded to any server, ensuring complete privacy and security for your sensitive documents.
🔒 100% Client-Side Processing
✍️ Draw Your Signature
📄 Multiple Pages Support
🖱️ Place Anywhere on Page
🎨 Customizable Size & Position
💾 Download Signed PDF
🆓 Completely Free
💡 How it works: Upload your PDF, draw your signature using the canvas below, select the page and position, and click "Place Signature". Your signature will be added to the PDF, and you can download the signed document instantly. Perfect for contracts, NDAs, and any document requiring a signature.
⚠️ Note: This tool adds a visual signature overlay to your PDF. It creates a graphical representation of your signature, not a cryptographic digital certificate. For legally binding documents, please ensure compliance with local e-signature regulations.
✍️ Sign PDF - Add Digital Signature
📄 Upload a PDF, draw your signature, and place it anywhere on the document.
or drag & drop a PDF file here
Frequently Asked Questions about PDF Signing
How do I create my signature?
Simply draw your signature using your mouse, touchscreen, or trackpad in the signature canvas area. You can clear and redraw as many times as needed. Once satisfied, click "Use This Signature" to save it for placement on your PDF.
Can I place the signature on any page?
Yes! Navigate through your PDF pages using the Previous/Next buttons, then click anywhere on the page to set the signature position. You can also manually enter X/Y coordinates. The signature will be placed on the currently displayed page.
Is this a legally binding digital signature?
This tool adds a visual representation of your handwritten signature to the PDF. While this is widely accepted for many business purposes, please check your local e-signature laws. For documents requiring cryptographic digital signatures, professional e-signature services may be needed.
Is my document secure?
Absolutely! The entire signing process happens locally in your browser using PDF.js and pdf-lib. Your PDF and signature never leave your computer — no uploads to any server. This ensures complete privacy for your contracts and sensitive documents.
Can I resize my signature?
Yes! Use the Width input field to adjust signature size. The height will scale proportionally to maintain the signature's aspect ratio. You can also reposition by changing X and Y coordinates.
What if I make a mistake?
You can clear your signature and redraw at any time. If you've already placed a signature, simply start over with a new PDF upload. The tool is designed for easy experimentation until you get the perfect signature placement.
Will this work on mobile devices?
Yes! The tool is fully responsive and works on smartphones and tablets. Use your finger or stylus to draw your signature on the canvas. The touch-friendly interface makes signing on mobile devices simple and intuitive.