Works on All Platforms
These password protection tools work entirely in your browser on any device - Windows, macOS, Linux, iOS, or Android. No software installation needed.
Password Protect PDF Online – Secure Your Documents Instantly
Encrypt and protect your PDF files with strong password protection online. Keep your sensitive data safe with robust AES encryption and customizable access permissions—no installation or registration required.How to Password-Protect a PDF Online
Simple steps to enhance your PDF documents
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Step 1
Follow these 3 simple steps:
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Step 2
Upload your PDF file to the secure tool.
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Step 3
Set a strong password and customize permissions if desired.
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Step 4
Download your password-protected PDF.
No installation, no sign-up, and no watermarks—just fast, free protection.
Key Features
Discover what makes our tool powerful and easy to use
Prevent Unauthorized Access
Password-protect your PDFs so only users with the correct password can open or edit them.
AES 128-Bit or 256-Bit Encryption
Advanced Encryption Standard (AES) makes your file nearly impossible to crack. PDF24 offers 256-bit encryption, while Smallpdf provides AES 128-bit—both secure for personal and professional use.
Customizable Permissions
Disallow printing, copying, or editing your PDFs. Some tools like PDF24 let you fine-tune document permissions before encryption.
Works on All Platforms
Password-protect your PDFs on Windows, macOS, Linux, iOS, or Android. All tools work directly in your browser—no downloads necessary.
How Secure Is Your PDF?
Smallpdf and PDF24 use TLS encryption during file upload and download, keeping your data safe throughout the process. Files are deleted automatically shortly after processing — no data retention or risks.
✅ Pro Tip: Use a strong password with at least 7 characters including uppercase letters, numbers, and symbols for maximum security.
Secure Your PDF Files in Seconds
Whether you're safeguarding confidential contracts, financial reports, or personal files, adding a password to your PDF is a simple and effective way to ensure only authorized people can view or modify your documents.
Tool FAQs
FREQUENTLY ASKED QUESTIONS
We are here to answer your questions!Got questions about our tool features? We've gathered answers to the most common inquiries. Need more help? Reach out to our team.