SECURITY TOOL

Protect PDF

Lock and encrypt your PDF document with a secure password and custom permission controls. All encryption executes locally on your device via standard Web Crypto APIs — your confidential documents, passwords, and private data are never sent over the Internet.

HOW TO USE

Step-by-step guide

Step 1: Select your PDF document or drag and drop it into the dropzone.
Step 2: Enter your desired user password to lock document opening, plus optional permission toggles (printing, copying).
Step 3: Click "Protect PDF" — your browser encrypts the file with AES-256 and starts the download immediately.

FAQ

Frequently asked questions

What encryption standard is used to protect my PDF?

PDF Toolbox uses industry-standard 128-bit and 256-bit AES encryption compatible with all major PDF viewers including Adobe Acrobat, Apple Preview, and Google Chrome.

Is it safe to password-protect sensitive bank statements or contracts here?

Yes. Unlike typical online PDF editors that upload your files to remote cloud servers, PDF Toolbox encrypts files entirely inside your browser memory. Your files and passwords never touch an external server.

Can I restrict printing or text copying in the protected PDF?

Yes. You can configure permission flags allowing or denying printing, content extraction, and document modification.

PRIVACY & SECURITY

Client-side in-memory processing

PDF Toolbox is engineered with a strict browser-first architecture. All file operations execute entirely in your local browser sandbox via modern WebAssembly and JavaScript engines. No file bytes or sensitive document data are ever uploaded, buffered, or stored on external servers or cloud infrastructure. Memory buffers are cleared immediately when you finish or close your tab.

🔒 Zero server uploads: Processing stays on your device ⚡ Instant execution: No network upload/download queues 🛡️ Private & Confidential: Safe for legal, medical & financial files