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How to Password Protect a PDF File

Last updated

Plenty of documents shouldn't travel as plain PDFs — payroll slips, signed contracts, ID scans, NDA copies. A password and proper encryption turn the file into something only the right recipient can open.

This guide walks through adding password protection to a PDF using PDF Editor on iPhone or Android. It also covers what to avoid: weak passwords, legacy ciphers, and the wrong sharing pattern.

Step by step

  1. 1

    Open the PDF you want to protect

    Import from Files, your cloud drive, or via the share sheet from any app.

  2. 2

    Tap Protect

    Located under the document tools menu. Choose 'Password protect'.

  3. 3

    Pick a strong password

    At least 12 characters with a mix of letters, numbers, and symbols. Store it in your password manager.

  4. 4

    Choose restrictions (optional)

    Allow viewing but block printing, copying text, or extracting pages.

  5. 5

    Save as a new file

    Keep the original unprotected version if you might forget the password.

  6. 6

    Share the password via a separate channel

    Email the PDF; text or call the password. Never put both in the same email.

Tips

  • AES-256 is the right encryption — the app uses it by default.
  • Don't reuse the password across multiple documents.
  • If the recipient is non-technical, give them simple instructions on how to enter the password.

Try it on your phone

Protecting a PDF runs entirely on-device. Even in airplane mode, you can lock down a contract before sending it the moment you connect again.

Frequently asked questions

  • There's no backdoor. Strong encryption means no recovery. Store passwords in a password manager.

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