PDF Secure is a free app developed by iSolid SPRL for iPhone users. This utility and tools app allows you to protect your PDF documents with a password, ensuring that they can only be accessed by those who know the password. The app works on any platform, making it convenient for users with different devices.

In addition to password protection, PDF Secure also offers the option to completely remove password protection from a document. This feature can be useful if you no longer need the password protection or if you want to share the document with others who don't have the password.

Using PDF Secure is straightforward. Simply select a PDF document from your files, choose a password (ideally a strong one), and export the document to your preferred location, such as the Files app, a cloud drive, email, AirDrop, or messages. Once password protection is enabled, the password will be required to open the PDF on all platforms.

PDF Secure is compatible with the dark mode, ensuring a seamless user experience regardless of the device settings. Furthermore, the app is completely free with no in-app purchases or ads. It also prioritizes user privacy by not collecting any data. With PDF Secure, you can protect your PDF documents effortlessly and securely.