Add Signature to PDF Online for Free
Sign contracts, lease agreements, and invoices with your legally binding electronic signature. Draw, type, or sync from your mobile phone.
Sign Official Documents Effortlessly Without Printing
Printing a PDF, signing with a pen, and scanning it back in is slow, costly, and yields degraded documents. Electronic signing allows you to add an authentic signature directly on your screen in seconds.
With JustPDFConverter, you can draw your signature with a stylus, type with stylish script fonts, upload an image of your signature, or scan a QR code to sign smoothly on your smartphone screen.
Popular Everyday Use Cases
Real Estate & Rental Leases
Sign tenant agreements, renewal letters, and security deposit receipts from home.
Freelance & Business Contracts
Execute client proposals, NDAs, and service agreements without delays.
HR & Employee Onboarding
Sign W-4s, offer letters, and employee handbook acknowledgments in minutes.
How to Add a Signature to PDF in 3 Steps
Complete your signed documents in under a minute.
Upload Your Document
Select the PDF file that requires your signature.
Create & Place Signature
Draw your signature or sign on your phone, then drag and drop it onto the signature line.
Apply & Download
Click 'Sign PDF' and save your legally signed document instantly.
Mobile Phone Signature Sync
Drawing a smooth signature with a mouse can feel awkward. Our built-in Mobile Sync feature generates a private QR code: scan it with your phone, draw your signature smoothly using your finger or stylus, and watch it appear on your desktop screen instantly.
Signing Features
Frequently Asked Questions
Everything you need to know about processing files with JustPDFConverter
Is an electronic signature added with JustPDFConverter legally valid?
Can I add initials and the date alongside my signature?
More Sign PDF Utilities
You Might Also Need
Frequently used together with Sign PDF
Protect PDF
Encrypt your PDF with a password to keep sensitive data confidential.
Watermark
Stamp an image or text over your PDF in seconds. Choose the typography, transparency and position.
Edit PDF
Add text, images, shapes or freehand annotations to a PDF document.
Merge PDF
Combine PDFs in the order you want with the easiest PDF merger available.
Compress PDF
Reduce file size while optimizing for maximal PDF quality.