Password Protect PDF
Add a password to your PDF in seconds. 100% free, browser-based encryption — files never leave your device.
Files are encrypted in your browser — nothing is uploaded.
How it works
Upload PDF
Drag your PDF into the box or click to pick it from your device.
Set a password
Type a strong password and confirm it. Optionally add an owner password and restrict printing, copying, or editing.
Download protected PDF
Click Protect PDF — an encrypted, password-protected copy downloads instantly.
Frequently Asked Questions
How do I password protect a PDF?+
Upload the PDF above, enter a password, confirm it, and click Protect PDF. Your encrypted PDF downloads instantly and requires the password to open.
Is the protect PDF tool free?+
Yes — 100% free, no signup, no watermark, no file size limits. Everything runs in your browser.
Is my PDF safe? Do you upload it to a server?+
No. Your PDF never leaves your device. All encryption happens locally in your browser using strong AES encryption.
What encryption is used?+
Files are encrypted using the PDF standard security handler with AES so any compliant PDF reader (Adobe Reader, browsers, mobile viewers) will prompt for the password.
Can I restrict printing, copying, or editing?+
Yes. Open the Advanced options section to set an owner password and toggle restrictions on printing, copying, and modifying.
Does it work on mobile?+
Yes — the protect PDF tool works on any modern browser (Chrome, Safari, Firefox, Edge) on desktop and mobile.
What happens if I forget the password?+
The password cannot be recovered. Store it somewhere safe — without it, the PDF cannot be opened by anyone, including you.