Sign PDF Online — Free Signature Tool
Sign PDF lets you draw a signature with mouse or finger and stamp it onto any page. Useful for contracts, forms and approvals without printing. Private, free, unlimited on PDFStudio Pro.
Step-by-step instructions
- Open Sign PDF.
- Upload the PDF.
- Draw or type your signature.
- Place it on the page and download.
Supported formats
PDF (.pdf).
Privacy & security
Files are processed locally in your browser. We do not operate an upload endpoint for this tool. Temporary data is released when you leave the page. The site is served over HTTPS. See our Privacy Policy.
Pricing & workflow
Price: Free forever — no limits, no watermark. Workflow: open tool → add file(s) → process in browser → download. Works offline for most operations once libraries are loaded. Compatible with Chrome, Edge, Firefox and Safari on desktop and mobile.
Frequently asked questions
Is Sign PDF free?
Yes. Unlimited use, no registration, no watermark.
Are my files uploaded?
No. Processing is 100% in-browser.
Can I use it on mobile?
Yes, on modern mobile browsers.
Is there a file size limit?
We do not set a server limit. Practical limits depend on your device memory.
Does it add a watermark?
No. Output contains only your content.