Caesar Cipher
Caesar cipher encoder/decoder with custom shifts and ROT13.
Alphabet Mapping
Current A → D| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | A | B | C |
What is Caesar Cipher?
The Caesar cipher is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.
For example, with a shift of 3, A would be replaced by D, B would become E, and so on.
The method is named after Julius Caesar, who used it in his private correspondence for military communication.
About This Tool
The Caesar cipher is a classic shift substitution cipher that rotates letters by a fixed offset. This tool supports both encode and decode modes with a 0-25 shift range, built-in ROT13 quick action, and options to preserve non-letters and letter case. All processing is done locally for speed and privacy.
Features
- 🔄 Encode/Decode Modes: Bidirectional conversion with real-time output
- 🎚️ Shift Control: 0-25 adjustable with quick shift actions
- 🧩 Case & Symbol Handling: Preserve letter case and non-letters
- 📋 Copy & Swap: One-click copy and input/output swap
- 📚 Alphabet Mapping: Visualize the current shift rule