Adding a password, you could secure the PDF files stored locally on your iPhone.

Do note that your files stored in iCloud cant be protected using a passcode.

Step 1:Open theFiles appon your iPhone or iPad.

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Step 2:Open thePDFyou want to secure with a password.

Step 3:Tap thedrop-down menuat the top and then tap onLock PDF.

Step 5: Add the passwordfor your PDF.

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Step 6:Tap onDoneat the top-right corner to save the password.

Your PDF file is now password-protected on your iPhone.

it’s possible for you to tap on it and enter the password to enter the file.

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Share this file and the password with your contacts to prevent unwanted access.

like note thatyou cant remove the passwordfrom your PDF file.

Step 3:Tap theShareicon in the bottom-left corner and then selectLock PDFfrom the list of options.

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Step 4:SelectLock PDFfrom the list of options.

Step 5: Add the passwordfor your PDF and enter it again to verify.

Step 6:Tap onDoneat the top-right corner to confirm.

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Step 7:Tap onDoneat the top-right corner again to save the password.

you might use this feature to secure files stored on your iCloud.

Heres how to use it.

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Step 1:Open thebrowseron your iPhone or iPad.

Step 2:Visit the official website ofAdobe Acrobat PDF tool.

Step 3: pick the PDF filewhich you want to protect with a password.

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Step 4: type your password twiceto verify.

you could also use the strong password that your iPhone generates automatically.

Step 5:Click onSet Password.

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