This online tool allows you to easily add a password to your PDF files. Instead of downloading an app, simply upload the files here in the browser and protect your PDF documents with a password.
How to add a password to a PDF
Click on 'Choose file' or drag and drop the file that you would like to secure with a password
Enter your desired password and retype it for safety reasons in the second field
Choose between an encryption of 256 bits (maximum security) and 128 bits (for compatibility with older software)
Select if and with which quality your file may be printed, and if the text may be copied or edited
Click on 'Add password' below and download your encrypted file