Most online PDF protection tools require an account, limit how many files you can lock per day, or add a watermark. Dely PDF has none of that. Protect as many PDFs as you want, with the entire encryption process running locally in your browser instead of being uploaded to a server.

Dely PDF encrypts your PDF with AES-256, the same industry-standard encryption used by banks and government systems. It's applied automatically, with no extra setting to configure.

The password to open (user password) is required just to view the document. The permissions password (owner password) is a separate password used only to unlock restricted actions like printing or editing. Someone can open the file without it, but can't bypass the restrictions.

Yes, in Advanced mode. Granular permission controls, like blocking printing or copying, are part of Dely PDF Pro. Password-only protection to lock the whole document stays free.

Yes. Add multiple files and Dely PDF encrypts them all with the same password and settings, then lets you download everything as one ZIP.

Yes. Add a JPG or PNG and Dely PDF converts it into a PDF first, then encrypts it with your password.