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Vigenere Cipher
Keyword-based cipher.
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About Vigenere Cipher
Encrypt and decrypt text with a Vigenere keyword, A-Z only.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Vigenere Cipher on Wikipedia. More: all text tools.
Frequently Asked Questions about Vigenere Cipher
How do I use the Vigenere Cipher?
Open the Vigenere Cipher and use the controls in the workspace below: keyword-based cipher. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the Vigenere Cipher free?
Yes. The Vigenere Cipher is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the Vigenere Cipher store or share my data?
No. The Vigenere Cipher runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the Vigenere Cipher for?
Encrypt and decrypt text with a Vigenere keyword, A-Z only. You will find it grouped under Text Tools together with 34 other free tools on the PrimeFreeTools homepage.
Related Articles & Guides
Sep 14, 2026
Vigenere Cipher: A Keyword Lock From the 1500s
Keyword-based cipher.
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