Sign PDF
Add your signature to a PDF — draw it or upload an image.
- No login
- No credit card
- 100% free
- Files never leave your device
Drag the signature to move it · drag the corner handle to resize.
How to sign a PDF online
- Drop your PDF into the box above — it opens instantly in your browser.
- Draw your signature with a mouse or finger, or upload a signature image.
- Drag it onto the right page and resize it until it sits where you want.
- Click Sign & download to save your signed PDF.
Is it private?
Completely. Your document never leaves your device — the PDF is opened, signed and saved entirely inside your browser using the open-source pdf.js and pdf-lib libraries. Nothing is uploaded, there's no account, and there are no watermarks on the result.
A handy tip
For the cleanest look, draw your signature slowly or upload a transparent PNG so only the ink shows. Working with several documents? Combine them first with our merge PDF tool, or turn scanned signature photos into a PDF with the image to PDF converter before signing.
Frequently asked questions
How do I sign a PDF?
Upload your PDF, then either draw your signature with the mouse or finger, or upload a signature image. Place and resize it where you want and download the signed PDF.
Is my document uploaded to a server?
No. Your PDF is signed entirely in your browser, so your document never leaves your device.
Can I use a transparent signature image?
Yes — a transparent PNG works best so only your signature shows over the page.