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Vigenère Cipher

Encode or decode text with the classic Vigenère cipher.

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Letters only; other characters are ignored

Input

Output

About the Vigenère Cipher

Encrypt or decrypt text with the polyalphabetic Vigenère cipher using a keyword. Non-letter characters are preserved, and case is maintained for both plaintext and ciphertext.

Examples

Encode with key LEMON

Attack at dawn

Output

Lxfopv ef rnhr

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser