Protect PDF (Add Password)
Add a password to a PDF so only people with the password can open it — strong AES-256 encryption.
1. Upload your file
How does the Protect PDF (Add Password) work?
Add a password to a PDF so only people who know it can open the file. Drop your PDF, choose a password (minimum 4 characters; longer is much stronger), and click Protect. Your password-protected PDF downloads. The encryption used is AES-256 — the same industry-standard strength used by banks and Adobe Acrobat for high-security documents. Important: anyone with the password can read, copy, print, and screenshot the content. Encryption protects the file from people who DON'T have the password — for truly sensitive documents, also send the password through a separate channel (text the password, email the file, or vice versa). There is no password recovery if you forget it, so save it somewhere safe before sharing.
🔒 Security & Privacy
Files are encrypted in transit and processed on a secure server. Your file is automatically deleted right after you download — we never store your documents.
📱 Use it on any device
Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.
⚡ Quick & easy
Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.
🎁 Always free, no signup
Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.