LovelyPDF applies AES-256 encryption to your PDF directly in the browser using pdf-lib. You can set an open password (anyone opening the file must enter it), an owner password (controls whether the recipient can print, copy text, or edit), or both. Your file and passwords never leave your device.

1. Upload your PDF by clicking or dragging it onto the tool
2. Enter an Open Password if you want the recipient to need a password just to view the file
3. Enter an Owner Password if you want to control printing, copying, or editing permissions
4. Select which actions to allow (print, copy text, fill forms, etc.)
5. Click Protect PDF and download your encrypted file

An open password locks the entire document — nobody can read it without entering the password first. An owner password is invisible to viewers; the document opens normally, but restricted operations (printing, selecting text, editing) are blocked by the PDF reader.

Banks commonly use owner-password-only restrictions on statements to prevent editing the figures. CAs and tax consultants often use the client's PAN number as the open password. For maximum security, set both: a strong random open password and a separate owner password to block printing.

What encryption strength does LovelyPDF use?
AES-256, the strongest encryption level in the PDF standard — compatible with Adobe Acrobat, macOS Preview, Chrome, Foxit, and all modern PDF readers.

Is it safe to set the password in the browser?
Yes. Encryption runs entirely in JavaScript on your device. Your PDF and your passwords are never sent to any server.

What should I use as the password for sending documents to clients?
A common convention in India is to use the recipient's PAN number, date of birth (DDMMYYYY), or mobile number — easy to communicate verbally without writing it in the same email as the document.

Can the owner password be bypassed?
Owner passwords are a deterrent, not an absolute technical lock — they prevent casual copying and printing in compliant PDF readers but won't stop a determined user with specialist software.