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Password protect PDF online free. Add a password to your PDF so only you can open it — no signup, no upload, no limits.
All processing happens entirely in your browser. Nothing is uploaded to any server.
Select or drag the PDF you want to protect.
Enter a strong password to secure your PDF.
Click protect to apply password encryption.
Save your password-protected PDF.
Processing
100% browser-based
File Privacy
Never leaves your device
Price
Free forever
Requires
Modern browser (Chrome, Firefox, Safari, Edge)
Yes, Protect PDF is completely free. There are no pricing tiers, no hidden costs, and no usage limits.
No. Protect PDF processes everything entirely in your browser. Your files never leave your device.
Protect PDF supports standard PDF files. For image-based tools, JPG, PNG, and WEBP are supported.
Yes. Use the Unlock PDF tool to remove password protection from any PDF you own — you'll need the current password to unlock it.
No. Password protection is applied locally in your browser — the password is never sent to a server or stored. Only your encrypted PDF is saved.
Use at least 12 characters mixing uppercase, lowercase, numbers, and symbols. Since PDF encryption is processed on your device, a strong password keeps your document secure.