Convert PNG to PDF and Password Protect PDF for iPhone For Free

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In the Preview app on your Mac, open the PDF that you want to password-protect. Choose File > Export, then select Encrypt. You can also enter a new name for the PDF if you want to create a pass worded copy and keep the original PDF unencrypted. Type a password, then retype it to verify the password.
If you do not want to compress files, but merely lock files and prevent them from authorized access, you can choose the Lock option. After that, you will be able to choose a 4 digits password or passcode to lock the data. You can't delete locked folder which is protected with a password by File Master on iPhone.
No. You can download apps that allow you to password protect data inside the app. Not natively, however there are apps that you can purchase for this purpose. The Best secret folder, and folder lock for iPad, allows you to password protect folders.
Download Pinault. This application securely stores your private iPhone photos by creating a folder and locking the folder once you exit the application. Download Secure Folder. Download HD Secure File Storage/Viewer.
Run the file manager app on your iPhone or iPad. Tap Settings at the bottom, select Enable Password, you will then be able to set a password to protect any sensitive data on the phone.
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