Protecting a PDF with a password is the fastest way to prevent unauthorized access. This guide shows you how to do it for free in your browser — no software, no account.
Open the protect tool in any modern browser. Works on Windows, Mac, iPhone, and Android.
Upload your PDF and enter a strong password. RC4-128-bit encryption is applied automatically.
Tip: Use a password of at least 12 characters mixing letters, numbers, and symbols. Never share the password in the same email as the PDF.
Download the encrypted PDF. Send it via email, WhatsApp, or any platform — only someone with the password can open it.
Yes — 100% free at pdfeditor.onl/protect-pdf with no account required.
RC4-128-bit encryption — supported by Adobe Acrobat, Apple Preview, Foxit, Chrome, and all modern PDF viewers.