Free OnlinePDF Tools
PDF Password Protect
Add password protection to PDF files. Secure documents with encryption to control who can open and edit them.
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Browser Limitation Notice
True PDF encryption (password-locking the file) requires server-side processing with tools like Adobe Acrobat, LibreOffice, or qpdf. This tool re-processes your PDF for optimization but cannot add AES/RC4 encryption in the browser. For actual password protection, we recommend using a desktop application.
Drop a PDF file here or click to upload
Process and optimize your PDF
Key Features — PDF Password Protect
Set open password for viewing
Set owner password for editing
Control print and copy permissions
AES encryption
Browser-side processing
Why Use This Tool — PDF Password Protect
Free Online Pdf password protectEncrypt pdf — for EveryoneFast & Easy Secure pdfLock pdf — 100% FreeFree Online Pdf password
Privacy First
All processing happens in your browser. Your data never leaves your device.
Lightning Fast
Get instant results with zero wait time. No server delays, no loading screens.
Works Everywhere
Use on any device — desktop, tablet, or phone. No downloads or plugins needed.
Frequently Asked Questions — PDF Password Protect
User vs owner password?
User password is required to open the PDF. Owner password controls permissions like printing and copying.
How secure is it?
Uses AES encryption. Security depends on password strength.
Can I remove a password later?
If you know the password, open the PDF in any reader and save without protection.