Is it free to password-protect a PDF?

Yes, this tool is 100% free. There are no hidden fees, watermarks, or usage limits.

Is it secure? Are my files uploaded?

Your files are completely secure. All processing happens in your browser. Your PDFs and passwords never leave your device.

What type of encryption is used?

We use pdf-lib's built-in encryption which applies password protection compatible with most PDF readers.

Can I set different user and owner passwords?

The password you set serves as the user password required to open the PDF. An owner password is also set internally.

What is the file size limit?

Each PDF file can be up to 50MB.

Protect PDF

Add password protection to your PDF file. Encrypt your document to prevent unauthorized access. 100% private — processed in your browser.

Drag & drop a PDF file here

Only PDF files accepted. Max 50MB per file.

How to Protect a PDF

Add password protection to your PDF in 3 simple steps.

Upload PDF

Drag and drop or click to select a PDF file from your device.

Set Password

Enter and confirm a password to protect your PDF document.

Download

Click 'Protect PDF' and download your encrypted file.

PDF Protection Tips

Get the best results when protecting PDF files.

100% Private

All encryption happens in your browser using pdf-lib. Your files and passwords never leave your device.

Strong Encryption

Your PDF is encrypted with the password you provide. Anyone needs the password to open the file.

Instant Processing

Password protection is applied instantly. No waiting for server-side processing.

Remember Your Password

Store your password safely. If you forget it, there is no way to recover access to the protected PDF.

Protect PDF FAQ

Common questions about PDF password protection.