Vigenère Cipher Calculator
Free online Vigenère cipher calculator. Encrypt and decrypt text with a custom key and visual grid tracing.
Cipher Step-by-Step Trace
| Char | Key Char | Operation (A=0) | Result |
|---|
About This Free Online Vigenère Cipher Calculator
Our Vigenère Cipher Calculator allows you to encrypt and decrypt secret messages using a customizable key. Learn cryptographic concepts through our interactive visual grid which traces intersections on a Vigenère square.
Features of Our Vigenère Cipher Calculator
- Instant Encrypt / Decrypt modes
- Custom alphabetic keyword validation
- Step-by-step grid trace log
- 100% offline client-side code
How to Use the Vigenère Cipher Calculator
Using this tool is simple and requires no signup or registration. Follow these steps:
- Enter the text you want to encode or decode.
- Input an alphabetic key (e.g., "SECRET"). Non-alphabetic letters will be ignored.
- Toggle between Encrypt and Decrypt mode.
- Examine the cipher results and copy the resulting string.
Frequently Asked Questions About Vigenère Cipher Calculator
What is the Vigenère cipher?
The Vigenère cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers based on the letters of a keyword.
What happens to spaces and special characters?
Spaces, punctuation, and numbers are not altered by the cipher and are bypassed during shifts to preserve readability.
Why Choose Text Toolbox?
Text Toolbox provides free, private, and instant online text tools. Unlike other text utility websites that require signup accounts or send your data to servers, all our tools process your text entirely in your browser. This means your content never leaves your device — we cannot see it, store it, or share it. Our tools are fast, lightweight, and work on any device with a modern web browser.