This free service allows you to encrypt rich text data in a safe way. Choose a strong passphrase (or just click generate button) and it will take over the age of universe to brute-force attack your data. I use Advanced Encryption Standard (AES-256), approved by the National Security Agency (NSA) for top secret information.
Unless you choose a stupid passphrase like
12345, the sun should stop burning before your data was decrypted.
Please, check the FAQ for more infos.