Once an open password is set, anyone opening the file must type it first. You can also set an owner password so that only people who know it can change the permission settings.
PDF only, multiple files at once (max 20) · up to 200MB each · max 500 pages
Upload PDF → set options → download: three steps
Click or drag files into the upload area, page count and size are detected automatically.
Enter the open password, and the owner password if you need one.
Processing runs locally on the server, then you can download the new PDF right away.