Protect PDF with Password
Encrypt your PDF document with AES-256 standard password protection.
AZ2PDF Protect PDF is a free, high-speed online utility designed to encrypt your pdf document with aes-256 standard password protection. Operating securely in volatile RAM memory with automated 5-minute permanent file deletion, your documents remain private without requiring user accounts or software installation.
High-speed secure cloud storage for businesses & developers.
or drop files here
Supports PDF up to 50MBHigh-speed secure cloud storage for businesses & developers.
How it works
Select PDF File
Upload or drag & drop the sensitive PDF document you want to secure.
Set Password & Encryption
Enter a strong password and choose military-grade AES-256 standard encryption.
Download Protected PDF
Download your encrypted PDF file. Only password holders can open and read it.
Frequently asked questions
Is Protect PDF on AZ2PDF completely free?
Yes, Protect PDF is 100% free with unlimited usage, no registration required, no subscription fees, and zero watermarks.
Are my documents safe and private?
Absolutely. Files are processed securely in high-speed RAM and permanently purged after 5 minutes by our automated cleanup daemon.
Can I edit or clean hidden PDF metadata properties (Author, Title, Keywords)?
Yes. You can inspect and modify standard Info Dictionary and XMP metadata fields—including Title, Author, Subject, Keywords, Creator, and Producer—to keep document properties professional and accurate.
What is the maximum file size limit?
You can process files up to 30MB instantly in high-speed RAM, with background asynchronous delivery available for larger documents.
High-speed secure cloud storage for businesses & developers.