Caesar Cipher

What Is a Caesar Cipher?

The Caesar Cipher tool shifts every letter by a fixed number of positions in the alphabet. It is one of the oldest known ciphers, used by Julius Caesar. A shift of 3 turns 'HELLO' into 'KHOOR'. This free online tool is useful for Caesar cipher, Caesar cipher decoder, Caesar cipher online. Common use cases include cryptography education, puzzles, historical ciphers, and simple substitution exercises. It is designed for quick browser-based hashing, encoding, decoding, encryption testing, checksum comparison, identifier generation, and cryptography education. For production security, follow the algorithm's current standards, key-management requirements, and application-specific security guidance.