Vigenère Cipher
Encrypt or decrypt text using a keyword-based polyalphabetic cipher.
Cryptography
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How to use Vigenère Cipher
Choose Encrypt or Decrypt mode.
Enter a keyword (letters only).
Type or paste your text in the input box.
Copy the output result.
Frequently Asked Questions
Is Vigenère secure?
Not by modern standards. It’s an educational cipher used to understand classical cryptography.
Does it preserve spaces?
Yes. Non-letter characters are preserved as-is.
What if my keyword includes symbols?
Only letters A–Z from the keyword are used.
Why use Kitbase Vigenère Cipher?
Keyword-based
A different shift is used for each letter based on the keyword.
Instant results
Runs entirely in your browser.
Demo included
Load a classic example to learn the cipher quickly.
Privacy-first
No uploads. Your text stays local.