Password Protect PDF

Add password protection to PDF files online for free. AES-256 encryption in your browser — no signup, no upload needed.

Frequently Asked Questions

How do I add a password to a PDF online for free?

Upload your PDF to PDFKits, enter your desired password, and click Protect. Your encrypted PDF downloads immediately.

What encryption does PDFKits use to protect PDFs?

PDFKits uses AES-256 encryption, the industry standard for PDF security, processed entirely in your browser.

Can anyone open my PDF without the password?

No. AES-256 encrypted PDFs are practically impossible to open without the correct password.