Easily protect sensitive PDF documents with military-grade 256-bit AES encryption using the free online Browser-Based Lock PDF tool on RiazHub.com. Set custom open passwords, owner permissions (prevent printing, block text copying, and disallow page modifications) entirely inside your web browser. Zero server uploads guarantee 100% document privacy and confidentiality.
Browser-Based PDF Lock & Security
Protect your PDF documents with standard 128-bit / 256-bit AES encryption & granular permission controls — tailored for RiazHub.com.
🛡️ 100% In-Browser Cryptography • Zero Cloud Uploads
Drag & Drop your PDF file here
Or click below to select a file from your computer
Unencrypted
🔑 Document Open Password
This password is required for recipients to open and view the PDF file.
Tips: Use 8+ characters with mixed case, numbers & symbols.
⚙️ Permissions & Owner Controls
🖨️ Prevent Printing
Block low & high resolution PDF printing
📋 Prevent Copying
Block text, table, and image extraction
✏️ Prevent Modifications
Block form filling, annotations, page editing
👁️ Allow Screen Readers
Enable content accessibility for assistive tech
🛡️ Live Protection Matrix
256-Bit AES
🔑 Password Protected
🖨️ Printing Restricted
📋 Copying Restricted
PDF Encryption Complete!
Your document has been securely encrypted with standard password protection and custom permissions entirely inside your browser.
❓ What is the difference between User Password and Owner Password?
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User (Open) Password: Required by anyone attempting to view or open the PDF file.
Owner (Master) Password: Required to change permission settings, un-restrict printing/copying, or remove encryption from the document.
Owner (Master) Password: Required to change permission settings, un-restrict printing/copying, or remove encryption from the document.
🛡️ Is my PDF document safe on RiazHub.com?
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Yes, 100%! All encryption, cryptographic key derivation, and file processing are executed entirely within your browser using Web Crypto API and client-side JavaScript. Your PDF file is never uploaded to any external server.
⚠️ What happens if I forget the password?
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Standard PDF encryption uses irreversible cryptographic algorithms (128-bit / 256-bit AES). If you forget the open password, the PDF document cannot be recovered by RiazHub or any third party. Please ensure you keep a copy of your password.
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