PDF Password Protector

Add Password Protection to a PDF

The PDF Password Protector encrypts a PDF and locks it behind a password, with options to control what recipients are allowed to do once they open it. It is the straightforward way to secure a document before emailing or sharing it.

The encryption happens locally in your browser. Your PDF is never uploaded to a server, which is essential when the document holds financial details, health records, legal material, or anything you would not want passing through someone else's system.

What Password Protection Does

Protecting a PDF can involve two distinct controls:

• An open password (user password) that a recipient must enter to view the document at all.
• Permissions that govern what they can do after opening, such as printing, copying text, or editing.

Applying a password encrypts the file's contents, so the data is not readable without the key, not merely hidden behind a prompt.

When to Use It

• Sending statements, invoices, or contracts over email.
• Sharing a document on a platform you do not fully trust.
• Distributing a read-only report you do not want altered or copied.
• Meeting a requirement to encrypt files containing personal data.

Tips for Strong Protection

• Choose a long, unique password and deliver it through a separate channel from the file itself.
• Set permissions to match intent, for example allow viewing but restrict copying or editing.
• Remember that permission flags are honored by well-behaved readers; the open password and encryption are what actually keep contents private.

Privacy by Design

Because the file is encrypted on your own device, the unprotected document never leaves your machine and the password is never transmitted to a server. That keeps the entire operation private from start to finish, exactly what you want when the reason for protecting the file is sensitivity in the first place.