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Choose a password and save an encrypted copy of your PDF.
You’ll set a password, then save an encrypted copy.
Runs on your device. Nothing uploaded.
Or drop files anywhere on this page.
Adding a password means nobody can open the PDF without it. Foldline encrypts the file with AES-256 and can also block printing, copying or editing. Everything happens inside your browser tab, so neither the file nor the password is sent anywhere. Keep the password somewhere safe: if it is lost, the file cannot be recovered.
When you choose a PDF, your browser reads it into memory and the code on this page edits it there. The file is never sent to Foldline’s servers or to anyone else; you can confirm this by watching the network tab in your browser’s developer tools.
It cannot be recovered. Foldline never sees or stores your password, and AES-256 cannot be broken by guessing in any practical time. Keep the password in a password manager, and keep an unprotected original somewhere safe.
Foldline uses 256-bit AES, the strongest standard PDF encryption. How well it protects the file still depends on your password, so pick a long one that is hard to guess.
The password you type first opens the file. An owner password is a second one that controls the restrictions, such as printing or copying. If you block anything and leave it empty, Foldline sets a random owner password so the restrictions cannot be lifted without breaking the encryption.
Restrictions are honored by most PDF apps, but they are a courtesy rather than a lock. Only the opening password truly keeps people out.
Foldline saves one protected PDF. If you load several files they are combined into one document first, in the order you see them in Merge PDFs.
No. Foldline opens and edits your PDFs with code that runs inside this browser tab. The file is read into your device’s memory, processed there, and handed back to you as a download. Nothing is sent to a server, and closing the tab discards it.