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How to Password Protect a PDF for Free

Add a password to a PDF with real AES-256 encryption — entirely in your browser. No upload, no account, no watermark.

🔒 Use the tool — free

Why protect a PDF with a password?

Contracts, payslips, IDs and medical records shouldn't be readable by anyone who gets the file. A password encrypts the PDF so only people who know it can open it. With iWorkPDF, the encryption happens locally — your sensitive document is never sent to a server.

Step-by-step guide

1

Open your PDF

Drop your PDF into the Security tool and choose "Protect".

2

Set a strong password

Choose a password that mixes letters, numbers and symbols. This password will be required to open the file.

3

Download the protected PDF

The encrypted file is generated locally and downloaded instantly. You can also unlock a protected PDF with the same tool if you know the password.

FAQ

Is the encryption real?

Yes. iWorkPDF applies genuine AES-256 encryption to the PDF, entirely in your browser — the password is required to open the file.

What happens if I forget the password?

There is no recovery. Strong encryption cannot be bypassed, so store your password somewhere safe.

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Ready to try it?

100% free · No account · No upload

Open 🔒 — free
🔒 Protect PDF 🗜 Compress PDF 🔀 Merge PDFs ✍️ Sign PDF ✂️ Split PDF 🔄 Rotate PDF