How to Password Protect a PDF Online — Free & Secure
Add password protection to your PDF files in seconds. Encrypt PDFs with 256-bit AES, set user and owner passwords, and control printing and editing — all in your browser.
How to Protect a PDF with a Password
- 1
Upload Your PDF
Select the PDF file you want to protect. We support all PDF documents; add password protection in seconds.
- 2
Set Your Password
Enter a user password (required to open the PDF) and optionally an owner password for extra restrictions like printing or editing.
- 3
Encrypt Your PDF
Click "Protect PDF" to encrypt your file with 256-bit AES encryption. Processing happens locally in your browser.
- 4
Download Protected PDF
Download your password-protected PDF. Only people with the password can open it. Keep your documents secure and private.
Why Use QuickPDF to Protect PDFs?
256-bit AES Encryption
Your PDF is secured with industry-standard encryption. Add password protection and control who can open, print, or edit your document.
Fast & Free
Protect PDF files online in seconds. No registration, no limits. Encrypt your PDF with a password right in your browser.
Works Everywhere
Add password to PDF on any device — Windows, Mac, Linux, iOS, or Android. No software to install.
Secure Your PDF Documents
Lock PDF files with a password to keep contracts, financial statements, and personal documents private. Our free PDF protection tool uses 256-bit AES encryption and runs entirely in your browser.
Your Files Stay on Your Device
We never upload your PDFs to our servers. Password protection and encryption happen locally in your browser, so your documents stay private and secure.
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