Apps with 'Text Encryption' feature Page 2 of 2

Private OpenPGP. Hardware security keys, password-store, no tracking. Open source.

Secure text editor with encryption.

TheLetterEncrypter is a small (14KB download) AES-based text-encryption program.

Post-quantum file encryption built on the age protocol. Seal a file to a quantum-safe ML-KEM-768 hybrid key, sign it with a YubiKey over NFC, and hand it to anyone with the age CLI. Any size you like: a 1 GB file encrypts like a small one.

Crypto Notepad stands out through its relatively simple design, as it looks very similar to the standard Windows Notepad. It offers a few extra features, such as encryption and a customizable UI, but it remains lightweight and very easy to use.

Disclaimer: Encryption algorithm has not been audited (and should not be used on sensitive stuff).

CTI Text Encryption is an AES-based text-encryption tool.