Vigenère Cipher
Encoding & Encryption · Free Online Tool
Vigenère cipher encrypt/decrypt with keyword-based polyalphabetic substitution.
Click "Encrypt" or "Decrypt" to transform your text...Keyword Based
Each letter shifts by the corresponding keyword letter, repeated cyclically.
Letters Only
Only A–Z and a–z are shifted; non-letters pass through and don't advance the key.
Case Preserved
Uppercase stays uppercase, lowercase stays lowercase; the key is normalized to A–Z.
How to Use Vigenère Cipher
- 1Enter or paste your data into the input field.
- 2Select the desired encoding, hashing, or encryption options.
- 3Click the action button to process your data.
- 4Copy the result from the output field.
Features
- ✓100% free — no signup, no subscription, no ads
- ✓Runs entirely in your browser — data never leaves your device
- ✓Fast and lightweight — instant results
- ✓Cross-platform — works on desktop, tablet, and mobile
Frequently Asked Questions
Is my data safe?
Yes. All encoding, hashing, and encryption operations run entirely in your browser. Your data is never sent to any server.
Can I use this for passwords?
We recommend using the Password Generator for creating secure passwords, and Bcrypt Hash for storing password hashes. Never store plain-text passwords.
What hash algorithms are supported?
The Hash Generator supports MD5, SHA-1, SHA-256, and SHA-512. For HMAC signatures, use the HMAC Generator.
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Learn the concept
Learn the concept
Understand the programming ideas behind this tool.