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Password Protect PDF Files on iPhone & iPad

The fastest way to protect PDF files on your iPhone or iPad. No uploads, no accounts, no hassle.

  • Lock any PDF with a password
  • Set open and edit permissions separately
  • Encrypted entirely on your device
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 on iPhone, download BossPDF from the App Store, tap Protect, select your files, and you're done. It works offline and takes seconds.

How to password protect pdf on iphone

  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

Protecting PDF files shouldn't require a computer, a subscription, or uploading sensitive documents to a server. Whether you're on a commute, in a meeting, or working from the couch — you need a tool that just works, right on your phone.

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.

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Frequently asked questions

How do I protect PDF files on my iPhone?

Download BossPDF from the App Store, open the app, tap "Protect", select your files, and tap the action button. Your protected PDF is ready in seconds.

Is BossPDF free to use for protecting PDFs?

Yes, you can try every feature free. BossPDF offers a free trial with no watermarks. Pro plans start at $4.99/week for unlimited access.

Can I protect PDFs offline with BossPDF?

Yes. BossPDF processes everything on your device. No internet connection needed, and your files are never uploaded to any server.

Does BossPDF work on iPad?

Yes. BossPDF is optimized for both iPhone and iPad, with full support for Apple Pencil and the larger screen.

Can I protect multiple PDFs at once?

Yes. BossPDF supports batch processing — select multiple files and process them all in a single tap.

Fast. Simple. Done.

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

Download on App Store
Download BossPDF — Free