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Password Protect PDF Free

Protect your PDF files free with BossPDF — the fastest PDF app for iPhone and iPad.

  • Lock any PDF with a password
  • Set open and edit permissions separately
  • No watermarks, no hidden fees — try every feature free
Download BossPDF — Free
4.8
App Store | Free to try
4.8 on App Store
No uploads ever
Works offline
Privacy-first
No account needed
Quick Answer

To protect PDF files free, open BossPDF on your device, select your files, and tap Protect. The entire process takes seconds and works right from your phone. No account needed.

How to password protect pdf free

  1. 1

    Open BossPDF

    Launch the app and select the PDF you want to protect.

  2. 2

    Tap the lock icon

    Open the password protection tool from the menu.

  3. 3

    Set your password

    Choose a strong password and confirm it.

  4. 4

    Set permissions

    Optionally set separate edit and print permissions.

  5. 5

    Save the protected PDF

    Save the encrypted file — it now requires the password to open.

Ready to try it?

Get BossPDF — Free on the App Store

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Why this matters

You need to protect a PDF, but every tool you find wants a subscription just to do one thing. You shouldn't have to pay before you even know if the tool works for you.

Why BossPDF

  • Strong PDF encryption for sensitive files
  • Separate open and edit passwords
  • All encryption processed on-device
  • Works offline — maximum security
  • Easy to apply and share securely

How people use BossPDF

Small Business Owner

Locking financial statements before emailing to the accountant.

Freelancer

Password-protecting a contract PDF before sending to a new client.

Remote Worker

Securing confidential HR documents shared over email.

Student

Protecting a personal statement with a password before submission.

Related guides

Password Protect PDF — Full Guide Password Protect PDF on iPhone Password Protect PDF on iPad Merge PDF Free Compress PDF Free

Explore more PDF tools

Password Protect PDF — Full Guide Password Protect PDF on iPhone Password Protect PDF on iPad Merge PDF Free Compress PDF Free Sign PDF Split PDF Scan to PDF

Frequently asked questions

Is BossPDF free to protect PDF files free?

Yes, you can try every feature in BossPDF for free. Download from the App Store and start protecting PDFs immediately — no account or credit card needed.

Can I protect multiple PDF files free?

Absolutely. BossPDF supports batch processing so you can protect multiple files at once. Select all the files you need and process them in a single tap.

Does BossPDF protect PDFs free without uploading my files?

Yes. BossPDF processes everything on your device. Your files are never uploaded to any server, making it completely private and secure.

What's the maximum file size I can protect with BossPDF?

BossPDF handles large files efficiently. There's no hard file size limit — even documents with hundreds of pages process quickly on your device.

Fast. Simple. Done.

Stop fighting with PDF tools. Download BossPDF and get it done in seconds.

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Download BossPDF — Free