Protect PDF with Password
Add a password to a PDF so it cannot be opened without it — AES-256 encryption, done in your browser — and optionally block printing, copying or editing.
What it does
Protect PDF with Password changes which pages a PDF contains, or how they sit, and leaves everything else alone. The page content is copied rather than re-encoded, so nothing is recompressed and no quality is lost between the file you drop in and the one you download.
When you need it
Typically when a document carries pages that should not be shared — an internal cover sheet, a duplicated scan, an appendix meant for someone else — or when a scanner produced pages sideways or out of order.
Limits and caveats
Your original file is never modified: you always download a new copy. Encrypted PDFs have to be unlocked before they can be edited, and a scan is still a scan afterwards — the pages move, the text inside them stays an image. Everything happens in your browser, so the file never leaves your device.
How to protect pdf with password
- Drop or choose your PDF file.
- KIVO processes it instantly — no waiting for uploads.
- Download the result. That's it.
Frequently asked questions
- How strong is it?
- AES-256, the strongest encryption the PDF format has, which every current reader supports. The weak point is the password itself: a long one is what keeps the file closed.
- What if I forget the password?
- The file stays locked. There is no recovery, here or anywhere — that is what encryption means. Keep the password somewhere safe.
- Do my files get uploaded?
- No. This tool runs entirely in your browser, so the file never leaves your device.