The AES Encrypt / Decrypt tool lets you protect sensitive text with a password-based key using client-side encryption. AES, or Advanced Encryption Standard, is widely used around the world to secure data in banking systems, messaging applications, and cloud services. This tool brings a simplified version of that concept to your browser so you can experiment with encryption for personal use.

You can type or paste any text, choose a secret passphrase, and then encrypt the content into an unreadable string. Only someone who knows the same passphrase will be able to decrypt it back into the original message. This is useful for sharing private notes, temporary secrets, or instructions over email or chat without revealing them to anyone who might intercept the message.

All encryption and decryption in this tool happens directly in your browser using the Web Crypto API. Your text and password are never transmitted to a server, which keeps your data under your control. While this tool is not intended to replace professional-grade security systems, it offers a practical and educational way to understand how encryption works and how it can improve your privacy.