Codex is a fully offline, cross-platform text encryption and decryption tool built for secure, on-the-go usage. Designed to work directly from a USB drive or a single .html file stored anywhere, it runs smoothly on Windows, macOS, Android, and iOS — no installation, no internet, just plug and launch.

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🌐 What is Codex?

Codex is a standalone web application that uses a custom text-to-number mapping system to encode and decode information securely.

Features include:

• A defined code language that maps letters to numbers (e.g., A → 14, H → 5, I → 20)
• Live word-by-word encryption — each word converts to code as you type and press space
• Visual distinction: encoded words are displayed with a line above, real numbers are enclosed in {brackets}
• A toggle switch to instantly convert between Text-to-Code and Code-to-Text

🔒 Key Security Features

• Password-Protected Access: Codex requires a password every time it starts, dynamically generated from the current date. You can also set your own custom password.
• Auto Lock: Automatically locks after 5 minutes of inactivity.
• Encrypted File Handling:
  • Upload and decrypt .txt or .pdf files
  • Download encrypted output with secure formatting
  • Files are timestamped and password-protected

📦 Offline and USB-Ready

Codex is 100% offline and runs from any USB drive. Just plug it in and open the HTML file in your browser — no internet, installation, or software setup required.

💡 Why I Built It

I built Codex to solve a real problem: how to securely store and share sensitive text without relying on the cloud or any third-party service. No account, no server, no data ever leaving your device — just a single portable file that works wherever you plug it in.