Sign PDF Documents with Digital Signature
Add your signature to a PDF document by drawing or uploading an image.
Related PDF Tools
What is Sign PDF?
Sign PDF adds legally binding electronic signatures, handwritten initials, and verification date stamps to contracts, leases, and approval forms. Instead of printing documents, signing with a pen, and scanning them back, this tool lets you draw your signature on screen, type a stylized script name, or upload a transparent signature image, placing it anywhere on your document with precise scale and position controls. Signatures merge smoothly into the document without compromising text searchability or page formatting.
How to Use Sign PDF in 4 Easy Steps
Step 1
Upload your contract or form to display the interactive document viewer.
Step 2
Choose your signature method: Draw with mouse/finger, Type a script name, or Upload an image.
Step 3
Click on any page location to place your signature and adjust its size handles.
Step 4
Click Apply Signature & Download to flatten your signature securely into the PDF.
Honest Technical Specifications & Limits
Input Modes
Draw via touchscreen/mouse, generate stylized typography signatures, or upload PNG scans.
Multi-Page Placement
Stamp signatures, initials, and date tags on multiple pages across the file.
Clean Output
Embeds signature graphics at full resolution without pixelated artifacts.
Privacy First: 100% Client-Side In-Browser Processing
100% In-Browser Local Execution. Sign PDF operates directly inside your browser memory using client-side JavaScript and WebAssembly. Your data is never transmitted over the internet or logged on remote servers. You can open Developer Tools (F12) Network tab to verify zero outbound network calls.
Verify it yourself: Open your browser's Developer Tools (F12 or Inspect), switch to the Network tab, and perform your action. You will observe zero outbound data uploads — your data never leaves your computer.
Popular Real-World Use Cases
Real Estate Leases & Rental Agreements
Sign tenant leases and property disclosure forms from your phone or laptop in seconds.
Employment Offer Letters
Accept job offers and sign onboarding forms electronically with professional signature stamps.
Vendor Service Agreements
Authorize purchase orders and contractor agreements without waiting for physical paper printouts.
ToolboxHive vs. Traditional Converters
| Feature / Requirement | ToolboxHive Sign PDF | Typical Upload Websites |
|---|---|---|
| Account and Signup | No account needed | Often requires email/login |
| File Upload to Remote Server | 0% (Local browser only) | Uploaded to remote cloud |
| Watermarks Added | Never (100% clean output) | Frequently added on free tiers |
| Processing Speed | Instantaneous (No queues) | Dependent on upload/queue speed |
| Daily Usage Limits | Unlimited free conversions | 2-3 files per day limit |