PDF Password Protector

PDF Password Protector writes a new encrypted PDF. You must set an open password. An optional owner password is used when provided; otherwise the open password is reused as the owner password.

• You have an unencrypted PDF you are allowed to encrypt before sharing.
• You want a Share, View only, Flexible, or Custom permission preset on the new file.

• Add an open password before emailing a working copy.
• Use View only when you want print/copy/modify/annotate flags all off in the new file.
• Set a separate owner password when you do not want it to match the open password.

pdf-lib-plus-encrypt loads the bytes, then encrypt({ userPassword, ownerPassword, permissions }). Printing is stored as highResolution or false. The download is {base}-protected.pdf.

Share

Print on; copy, modify, annotate off.

View only

Print, copy, modify, annotate all off.

Flexible

Print, copy, and annotate on; modify off.

Custom

Each of those four flags is taken from the checkboxes.

Input

One PDF, up to 50 MB.

Output

{base}-protected.pdf

Passwords

Open password required and must match confirmation. Generate-password helper builds a 12–32 character mix from a limited character set.

1. Upload a PDF that is not already encrypted.
2. Enter and confirm the open password.
3. Optionally set a different owner password.
4. Pick Share, View only, Flexible, or Custom.
5. Click Protect PDF.
6. Open {base}-protected.pdf in a reader and test the password.

The result is a newly encrypted PDF. Rewriting typically invalidates existing certificate signatures. Store the password; the tool does not recover it later.

Encryption runs in the browser. The PDF and passwords are not uploaded to a protection API. Identified analytics may include byte counts and permission-preset labels, not the password strings or document text.

• PDF Unlocker decrypts when you already know a current password, using QPDF WebAssembly.
• PDF Editor & Signer is a server-backed visual editor, not an encryption tool.

• Confirm a reader prompts for the open password.
• Check print/copy behavior in the reader you actually use.
• Keep an unencrypted original if you still need it.
• Rewriting typically invalidates existing certificate signatures.