Quick answer
To password-protect a PDF for free: choose a PDF, then type a password twice, then select Protect PDF and download. Bussnizz does this in your browser, so the file never leaves your device and there is no sign-up or watermark.
How to use Protect PDF
- Choose a PDF.
- Type a password twice.
- Select Protect PDF and download.
Where your file goes
Nowhere. Protect PDF runs inside this browser tab using PDF.js and pdf-lib. Your document is read from your device, processed in memory, and the result is saved back to your device. Closing the tab clears it.
Common uses at work
- Sign a quote, invoice, or agreement without printing it.
- Fill in a PDF form and save a completed copy.
- Remove hidden details, such as author names, before sending a file.
Questions people ask
Are my files uploaded?
No. This tool runs in your browser. Your file is read and processed on your device and never sent to our server.
What if I forget the password?
It can't be recovered, by us or anyone. Keep an unprotected copy somewhere safe.
Do the print and copy settings always work?
Most PDF readers respect them, but some apps ignore them. The password to open the file is the real protection.
Do I need an account?
No. Every tool marked In your browser works without signing up, and there is no watermark on the result.
Does it work on a phone?
Yes, in any modern mobile browser. Very large files are easier to handle on a computer because phones have less memory.