Free Online Sign PDF | Add Digital Signatures

Quick Guide

Step 1: Upload your PDF file via file picker or drag & drop
Step 2: Type, draw, or upload your signature image
Step 3: Click on the document to place your signature
Step 4: Download signed PDF

What is Sign PDF?

Sign PDF adds digital signatures to PDF documents. See also: protect-pdf or annotate-pdf.

How It Works

Upload or load your PDF into the tool, configure the settings as needed, and click the process button. The tool reads and modifies the PDF structure using client-side JavaScript libraries, then generates a downloadable output file. Your documents never leave your browser.

Use Cases

Professionals who need to modify PDF documents quickly without Adobe Acrobat
Students annotating or organizing research papers and study materials
Anyone who needs a fast, private way to edit PDF files on any device

Frequently Asked Questions

Is the Sign PDF free?

Yes, the tool is 100% free with no file size limits or usage restrictions.

Are my PDF files uploaded to a server?

No, all processing happens in your browser using JavaScript. Files never leave your device.

What browsers are supported?

The tool works on all modern browsers including Chrome, Firefox, Safari, and Edge.

Related Tools

Add Watermark

Add text overlay

Add Page Numbers

Number pages

Protect PDF

Lock document