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Sign PDF Online Free

Add secure, legally-binding digital signatures to your PDF documents natively within your browser. Ensure compliant privacy practices instantly.

Sign PDF adds a handwritten or typed digital signature directly to a PDF document — processed entirely in your browser. Draw, type, or upload your signature, position it on the page, and download the signed PDF instantly. No account required. Ideal for contracts, forms, NDAs, and approvals where a legally valid signature is needed without printing.

Zero-Retention Privacy

Your files never leave your control.

End-to-End EncryptedLocal or secure tunnel processing
1-Hour Permanent DeleteSession data is automatically wiped

Frequently Asked Questions

Is an electronically signed PDF legally binding?

Yes. Electronic signatures applied via ConvertUniverse comply with the US eSign Act (2000) and EU eIDAS Regulation, making them legally equivalent to handwritten signatures in most jurisdictions.

Can I sign a PDF without creating an account?

Yes. The PDF signing tool works without any account or sign-in. Upload the PDF, create or upload your signature, place it, and download the signed document.

Where does my signature go — is it stored?

Your signature is processed entirely in-browser via WebAssembly. It is embedded directly into the PDF and never uploaded to or stored on any server.

Related Reading

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Why use Sign PDF on ConvertUniverse?

The most trusted PDF tools platform with everything you need to work smarter with documents.

Lightning Fast

Process your PDFs in seconds with our optimized tools. No waiting, just results.

100% Secure

Your files are encrypted and automatically deleted after processing. Privacy guaranteed.

Works Everywhere

Access from any device, any browser. No installation or registration required.

Always Free

All essential PDF tools are completely free to use. No hidden fees or subscriptions.

How does the Sign PDF tool work?

Transforming your documents hasn't been easier. Three simple steps to get professional results.

01

Upload Your File

Drag and drop your PDF or select it from your device. We support a wide range of formats for your convenience.

02

Choose Your Tool

Select from our comprehensive suite of PDF tools. Merge, split, compress, or edit with just a few clicks.

03

Download Result

Get your processed file instantly. Your files are automatically deleted from our servers after 2 hours for your privacy.

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