Does this add real password protection?

Yes. The output PDF is encrypted with an open password, so PDF readers should ask for that password before showing the document.

Can I stop printing, copying, or editing?

Yes. Turn those permissions off before creating the protected PDF. Some PDF readers may handle permissions differently, but the password lock is applied to the file.

No. The PDF is encrypted in your browser with a QPDF WebAssembly engine. Your file and password stay on your device.

Should I compress before or after protecting?

Compress before protecting. Once a PDF is encrypted, other tools usually need the password or an unlocked original before they can process it.

Does this change the visible PDF pages?

No. Protect PDF encrypts the file and applies permission settings. It does not add a watermark, flatten forms, or lower image quality.

Can I recover a forgotten password?

No. Keep the password somewhere safe. If you forget it, use your original unprotected file.

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Protect PDF

Lock a PDF with a password so the protected copy asks for the password before it opens. Choose whether to allow printing, copying, or editing.

Upload PDF fileSelect a PDF to lock with a password.

Upload a PDF and enter a password to lock it.