Sign PDF

Upload a PDF to sign it using the built-in PDF.js viewer. Look for the signature / pen tool in the toolbar to add your signature.

Click to select a file or drag and drop

PDF Documents

Your files never leave your device.

How It Works

1

Upload your PDF

Drag and drop or click to select your file.

2

Create or upload signature

Draw, type, or upload your signature.

3

Download signed PDF

Click download to save your signed document.

Why SwiftPDFLab?

100% Client-Side

All processing happens in your browser. Files never touch our servers.

Works Offline

Once loaded, works without internet. Perfect for confidential documents.

No Account Needed

Start immediately. No sign-up, no email required.

Free Forever

No trials, no premium tiers. Every feature is completely free.

Frequently Asked Questions

Is this PDF signer free?

Yes, completely free with no limits. No subscription or hidden fees.

Are my documents uploaded to a server?

No, all signing happens locally in your browser. Your files never leave your device, ensuring complete privacy.

Is the electronic signature legally binding?

Electronic signatures can be legally binding for many purposes under laws like ESIGN (US) and eIDAS (EU).

Can I save my signature for reuse?

Yes, your signature is stored locally in your browser for future use.

Explore More PDF Tools

See How We Compare