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Vigenère Cipher Tool

Encode or decode letters with a repeating-key Vigenère cipher while preserving spaces and punctuation in your browser.

How to Use

  1. 1Open the Vigenère Cipher Tool tool in your browser.
  2. 2Paste or type your content into the input field.
  3. 3The tool processes it instantly — no page reload needed.
  4. 4Copy the result with one click, or download it if available.

About this tool

Encode or decode text using a keyword-based Vigenère cipher. Runs fully offline in your browser — sensitive data never touches a server.

Frequently Asked Questions