How to Password Protect a PDF on Linux
Add a password to a PDF on Linux without installing any software. Works in Firefox or Chrome — free and private.
Protecting a PDF with a password on Linux doesn't require LibreOffice, qpdf, or any command-line tools. FixMyPDF handles it in Firefox or Chrome entirely in the browser.
Open Firefox or Chrome on Linux
Open Firefox or Chrome and navigate to fixmypdf.in/tools/protect. Works on Ubuntu, Fedora, Debian, Arch, and all major distros.
Upload Your PDF
Click "Choose File" and select the PDF you want to password-protect from your Linux filesystem.
Set a Password
Enter a strong password. The encryption is applied client-side using WebAssembly — your file never leaves your Linux machine.
Download the Protected PDF
Click Protect and download the encrypted PDF. Open it with Evince, Okular, or any PDF viewer — it will prompt for the password.
Alternative to qpdf
qpdf is a common Linux CLI tool for PDF encryption, but requires installation and terminal knowledge. FixMyPDF does the same in a browser, no sudo needed.
Try Protect PDF Now — Free
Browser-based, private, and instant. No account or software required.
Open Protect PDF