🔐 Real 128-bit encryption
Your PDF is encrypted with the standard PDF security handler (128-bit) — any PDF reader will ask for the password to open it.
Protect PDF with Password — Free Online
Encrypt your PDF so only people with the password can open it. Free, no sign-up — your files stay in your browser.
- ✓ 100% Free
- ✓ No sign-up
- ✓ Files stay in your browser
Drag & drop your PDF here
or
Choose File🔒 Your files are processed locally in your browser and never uploaded to any server.
Advertisement
⚠️ Remember your password — there is no way to recover it. Nobody, including PDFLite, stores it.
How to password-protect a PDF in 3 steps
- 1. Upload your PDF
Drag and drop your PDF into the upload zone, or click “Choose File”.
- 2. Set a password
Type a password (minimum 6 characters) and confirm it. Longer passwords are stronger.
- 3. Protect & download
Click “Protect PDF”. Your encrypted document downloads instantly.
Why use PDFLite's free PDF protector?
💪 Strength meter
A live indicator tells you whether your password is weak, medium or strong as you type.
🔒 Private by design
Encryption happens entirely in your browser. Your file and password never leave your device.
📱 Works everywhere
Use it on Windows, Mac, Android or iPhone — right in your browser. Nothing to install.
Frequently asked questions
How do I password-protect a PDF for free?
Upload your PDF to the protector above, set a password (minimum 6 characters), and click “Protect PDF”. The encrypted file downloads instantly.
What happens when someone opens a protected PDF?
Any PDF reader will ask for the password before showing the document. Without it, the file cannot be opened.
What if I forget the password?
There is no way to recover it — the encryption is applied in your browser and nobody, including PDFLite, stores your password. Keep a copy somewhere safe.
Is my PDF uploaded to a server?
No. Encryption happens entirely in your browser. Your file and your password never leave your device.
Can I remove the password later?
You would need a PDF unlock tool and the password. PDFLite does not currently offer an unlock tool.