🔐 Secure Note Utility

Security Assurance: All encryption and decryption operations happen entirely within your browser using the standard Web Crypto API (AES-GCM, key derived with PBKDF2-SHA-256 at 600,000 iterations). This page ships a Content Security Policy that forbids any network connection, so your passwords and messages cannot be sent to any server. Remember to use a strong, unique password.

Encrypt Message

Enter your message and a password. The tool will encrypt your text using AES-GCM encryption. The output can only be decrypted with the correct password.

Decrypt Message

Paste the encrypted message (the long string of characters generated by the encrypt tool) and enter the original password to reveal the original text.

Replace Characters

Enter text and specify two single characters. The tool will swap every instance of the 'From' character with the 'To' character, and vice-versa, throughout the text.