Sign PDF
Add your signature to a PDF
About this tool
Add your signature to a PDF by drawing it, typing it, or uploading an image, then place it exactly where it belongs. Sign agreements and forms in seconds — entirely in your browser, with nothing uploaded to a server.
Three simple steps
How Sign PDF works
Upload PDF
Drop your file
Sign
Draw, type, or upload
Download
Signed PDF
Built for you
Why use PDFLabz?
100% Private
Files never leave your browser.
Free, no signup
Unlimited use, no account.
No watermarks
Clean, untouched output.
Works everywhere
PC, Mac, phone, tablet — all browsers.
FAQ
Frequently asked questions
Is my signature legally binding?
Electronic signatures are recognized in many jurisdictions. For high-stakes legal documents, check your local rules.
Is Sign PDF really free?
Yes — every tool on PDFLabz is free with no daily limit, no account, and no watermark.
Are my files private?
100%. This tool runs entirely in your browser using JavaScript. Your files never reach our servers.
Is there a file size limit?
Up to 100 MB per file. Larger files just take longer because everything runs locally on your device.
Do I need to install anything?
No installation. Any modern browser (Chrome, Firefox, Safari, Edge) on any OS works.
Privacy first
This tool runs entirely in your browser. Your file never reaches our servers.