How to Lock PDF Files on iPhone

PDF (Portable Document Format) files are a popular choice for preserving document formatting across different devices and platforms. However, to safeguard sensitive information, it’s essential to add an extra layer of security. If you’re an iPhone user, you can easily lock your PDF files to protect your confidential data. In this guide, we’ll walk you through the steps to lock PDF files on your iPhone using the new feature introduced in iOS 16 and iPadOS 16.


Step 1: Open the Files App

Begin by launching the Files app on your iPhone.

Step 2: Navigate to the PDF File

Locate the folder where your PDF file is stored.

Step 3: Select the PDF File

Tap on the PDF file you want to lock to select it.

Step 4: Access Options Menu

In the upper left corner of the screen, just after the document name, you’ll find a drop-down icon. Tap on it.

Step 5: Choose “Lock”

From the available actions, select “Lock”.

Step 6: Set a Password

If this is your first time using this feature, you’ll be prompted to set a password.

Step 7: Enter Your Desired Password

Enter the password you’d like to use to secure the PDF file. Tap “DONE” once you’ve entered it.

Step 8: PDF File Locked Securely

Congratulations! Your PDF file is now securely locked and protected from unauthorized access.

Important Note:

Please be aware that PDF files stored in iCloud cannot be password protected. Ensure that your device’s software is updated to the latest version to access this feature.


With the introduction of iOS 16 and iPadOS 16, iPhone users now have the capability to lock their PDF files for added security. By following these simple steps, you can ensure that your confidential documents remain safe from prying eyes. Remember to keep your device’s software up-to-date to take advantage of this valuable feature. Safeguarding your private data has never been easier!

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