Sign a PDF Online — Add Your Signature
Draw your signature with a mouse or finger and place it onto any page of a PDF. A fast, private way to sign contracts, forms and NDAs without printing.
Sign PDF
Draw a signature and stamp it on a page
About the Sign PDF tool
This tool lets you sign a PDF entirely in your browser. Your signature is drawn onto a transparent canvas and embedded directly into the page — no third-party e-sign service, no cloud account.
Combine it with Flatten PDF to make the signature un-editable, or with Protect PDF to lock the signed document with a password.
Key features of Sign PDF
- Draw your signature with mouse, trackpad or touch
- Place, scale and reposition on any page
- Signature is embedded, not linked to an external service
- Perfect for contracts, NDAs and consent forms
- Free, unlimited, and works on mobile
How to use Sign PDF
- Upload the PDF to sign.
- Draw your signature in the pad.
- Drag it onto the correct page and position.
- Download the signed PDF.
Common use cases
- Sign freelance contracts and SOWs
- Add your signature to NDAs and consent forms
- Sign school permission slips from your phone
- Approve invoices with a hand-drawn signature
- Countersign vendor agreements without printing
Frequently asked questions
Is a hand-drawn signature legally valid?
In many jurisdictions, an image of a hand-drawn signature is accepted as a valid electronic signature. For legally binding contracts, check the rules that apply where you live and consider a certified e-signature provider.
Can I add more than one signature to the PDF?
Yes. Repeat the drawing step or re-run the tool to add additional signatures on different pages.
Is this tool safe to use with confidential files?
Yes. Every file is processed locally inside your web browser using JavaScript and WebAssembly. Nothing is uploaded to a server, stored, or shared — so contracts, invoices, medical records and personal documents stay 100% private on your device.
Is it really free? Are there any limits or watermarks?
Yes, it's completely free with no sign-up, no daily limits, and no watermarks stamped on your output. Process a single file or hundreds — the only limit is your device's memory.