Add Signature to PDF
Why Use Our Online PDF Signature Tool?
Need a fast and secure way to sign PDF documents online? Docynx lets you add a digital or handwritten signature directly in your browser — with no software installation and no account required.
Whether you're signing contracts, agreements, forms, or approvals, our free PDF signer helps you complete documents in seconds.
- ✍️ Add signatures instantly – Upload or insert your signature image in seconds.
- 🔐 Private & secure – Your files stay on your device. No external uploads.
- 📄 Perfect for contracts & forms – Ideal for business and personal use.
- ⚡ No software required – Works on Windows, Mac, Android, and iOS.
- 🌍 Completely free – No sign-up, no watermark, no hidden charges.
How to Sign a PDF Online
Signing your PDF document takes only a few simple steps:
- Upload your PDF – Click “Select PDF” and choose your file.
- Add your signature – Upload a PNG or JPG signature image.
- Place it anywhere – Drag and position it on the page.
- Download your signed file – Save your updated PDF instantly.
Is Online PDF Signing Legal?
Yes. Electronic signatures are legally recognized in many countries, including the United States and the European Union.
For most agreements, contracts, and approvals, a simple electronic signature is fully valid and enforceable.
Who Uses This PDF Signer?
- Business professionals signing contracts
- Freelancers sending agreements to clients
- Students submitting forms
- HR teams processing documents
- Anyone needing a quick e-signature solution
Why Choose Docynx?
Unlike many online PDF tools, Docynx focuses on privacy, simplicity, and speed.
There are no forced registrations, no unnecessary compression, and no complicated steps — just a clean, efficient way to sign PDF documents online for free.