FREE · GENERATORS & RANDOMIZERS
Vigenère Cipher.
Encode or decode Latin letters using a repeating keyword.
How to use Vigenère Cipher
Enter the requested data or choose your settings, generate the result and review it before copying or downloading.
How it works
Encode or decode Latin letters using a repeating keyword. Key: 1–1,000 Latin letters. Nonletters are preserved and do not advance the key. Not secure encryption.
Example
ATTACKATDAWN with LEMON → LXFOPVEFRNHR
Questions about Vigenère Cipher
Is Vigenère Cipher free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Key: 1–1,000 Latin letters. Nonletters are preserved and do not advance the key. Not secure encryption. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.