Caesar Cipher
Caesar encryption tool
Note: All operations occur locally in your browser.
Input + output
Shift letters forward by this amount (0–25).
CaesarEncrypt
Caesar Encryption Online
The Caesar cipher is a simple substitution cipher that shifts letters by a fixed number. It is useful for learning basic cryptography concepts or for lightweight obfuscation, but it is not secure for protecting sensitive data.
How the Caesar Cipher Works
Each letter is shifted forward by the chosen amount. For example, with a shift of 3, A becomes D and Z wraps to C. Non-letter characters are left unchanged.
Example
Plaintext: attack at dawn with shift 3 becomes dwwdfn dw gdzq.
How to Use This Tool
- Choose a shift value from 0 to 25.
- Enter the text to encrypt.
- Click “Encrypt” and copy the result.
When to Use a Caesar Cipher
- Teaching or learning basic encryption concepts.
- Simple puzzles or demonstrations.
- Lightweight text obfuscation, not security.
Security Notes
- Caesar cipher is easy to break with brute force.
- For real security, use modern encryption tools (AES, etc.).