Protect PDF
Encrypt your PDF document locally with a password using industry-standard AES-256 (PDF 2.0 / ISO 32000-2) encryption.
Drop your PDF file here
or browse to select a document to encrypt
Select one file · Processed 100% locally
How to Use Protect PDF
Upload PDF
Select the document you want to secure.
Set Password
Enter and confirm your strong document password.
Encrypt & Download
Generate an encrypted PDF openable only with your password.
Capabilities & Features
- •ISO 32000-2 standard AES-256 bit encryption
- •Web Crypto API hardware acceleration
- •Configurable printing and copying permissions
- •Passwords never leave your device RAM
Important Notes & Limitations
- •Because encryption is 100% local with no cloud backdoors, lost passwords cannot be recovered.
Client-Side Privacy Guarantee
When using Protect PDF, your files, extracted text, and document metadata are processed exclusively inside your browser using client-side JavaScript, WebAssembly, and native Web Crypto APIs. Your document data is never sent to our servers or any cloud service. Once you close this tab or click clear, volatile memory is automatically released.
Frequently Asked Questions
What PDF readers can open protected files?
All standard readers including Adobe Acrobat, Apple Preview, Google Chrome, Safari, and Microsoft Edge.
Is the password transmitted to any server?
Never. The key derivation and cipher occur entirely in browser memory.
Explore More PDF Tools
All utilities run 100% locally in your browser.