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Sign PDF

Free online PDF signing tool. Add your signature image to PDF documents. Position anywhere on the page, adjust size, and apply to single or all pages. Perfect for contracts, forms, and official documents. All processing in your browser.

100% Private (In-Browser)Instant Web Worker SpeedZero Server Upload
Sign PDF by Privacy-First Toolbox is a 100% free, client-side browser utility. It processes your files locally on your computer or smartphone using HTML5 and Web Workers—zero bytes of your files or data are ever uploaded to any external server.

Key Features

  • Upload signature image
  • 7 position options
  • Adjustable size
  • Apply to all pages
  • PNG & JPG signatures
  • 100% private & secure

Common Use Cases

  • Sign contracts
  • Complete forms
  • Authorize documents
  • Add approval stamps

How to Use Sign PDF

Three simple steps to process your files securely in browser.

1

Select Your File

Drag and drop or browse your local file into the secure tool workspace.

2

Configure Options

Set quality, output format, or formatting options for your task.

3

Instant Download

Save your processed output immediately with zero server upload.

Frequently Asked Questions

🔒100% Client-Side: Your files never leave your device.