Vigenère Cipher
Polyalphabetic substitution using a keyword.
About the Vigenère Cipher Tool
Polyalphabetic substitution using a keyword. This free online tool runs entirely in your browser — no login, no installation, and no data is stored.
This tool is part of the Ciphers category on NumbersChecker. Browse all Ciphers tools or explore all 139 tools.
Related: polyalphabetic · key · encrypt
API usage
POST /api/vigenere
Content-Type: application/json
{
"text": "HELLO WORLD",
"key": "KEY"
}