Protect a PDF With a Password
Add an open-password to a PDF so only people with the password can view it. All encryption happens in your browser, so neither the file nor the password is ever sent to a server.
Protect PDF
Password-protect a PDF
About the Protect PDF tool
Password-protection is a quick way to keep bank statements, HR letters or client reports safe when shared over email or messaging apps.
Pair Protect PDF with Flatten PDF to lock a signed form completely before distribution.
Key features of Protect PDF
- Open-password encryption
- Works with modern PDF viewers (Acrobat, Preview, browsers)
- In-browser processing — nothing uploaded
- Free, unlimited, watermark-free
How to use Protect PDF
- Upload the PDF.
- Type the password to apply.
- Click ‘Protect PDF’.
- Download the encrypted PDF and share the password separately.
Common use cases
- Send salary slips securely
- Protect client contracts before emailing
- Password-protect medical or financial records
- Secure exam papers before distribution
- Add a light protection layer to shared drafts
Frequently asked questions
What happens if I forget the password?
There's no way for us to recover it — the password is only known to you. Store it safely.
Is a PDF password truly secure?
It's suitable for casual and business protection. For high-security needs, combine it with secure sharing channels and short expiry policies.
Is this tool safe to use with confidential files?
Yes. Every file is processed locally inside your web browser using JavaScript and WebAssembly. Nothing is uploaded to a server, stored, or shared — so contracts, invoices, medical records and personal documents stay 100% private on your device.
Is it really free? Are there any limits or watermarks?
Yes, it's completely free with no sign-up, no daily limits, and no watermarks stamped on your output. Process a single file or hundreds — the only limit is your device's memory.