Free Toolkit

Blowfish Encrypt/DecryptEncrypt and decrypt text using the Blowfish cipher.

Blowfish Encrypt/Decrypt illustration
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Blowfish Encrypt/Decrypt

Encrypt and decrypt text using the Blowfish cipher.

How to Use
1

Enter Input

Type or paste your input.

2

View Output

Results appear in real time.

3

Copy Result

Click Copy to copy the output.

What Is Blowfish Encrypt/Decrypt?

Blowfish by Bruce Schneier (1993). 64-bit blocks, variable key (32-448 bits). 16-round Feistel with key-dependent S-boxes. Unpatented. Slow key setup became basis for bcrypt. Uses crypto-js.

Why Use Our Blowfish Encrypt/Decrypt?

  • Fast, accurate processing
  • 100% client-side — data never leaves your browser
  • Free online tool with no signup required
  • Mobile-friendly with 44px touch targets

Common Use Cases

Development

Use in software development workflows.

Security

Cryptographic and security applications.

Education

Learn about algorithms and techniques.

Verification

Verify and validate data integrity.

Technical Guide

16-round Feistel on 64-bit blocks. Four key-dependent S-boxes and 18-entry P-array. Key setup: 521 encryption iterations. 64-bit blocks vulnerable to birthday attacks. crypto-js uses EVP_BytesToKey.

Tips & Best Practices

  • 1
    All processing happens in your browser
  • 2
    Results are deterministic for the same input
  • 3
    Use Copy button to quickly grab output
  • 4
    Works on mobile devices with touch-friendly interface

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Frequently Asked Questions

QIs this tool free?
Yes, completely free with no signup required.
QIs my data secure?
Yes. All processing is 100% client-side.
QDoes it work on mobile?
Yes, with responsive design and touch-friendly controls.
QWhat browsers are supported?
All modern browsers including Chrome, Firefox, Safari, and Edge.
QCan I use this offline?
The tool requires an initial page load but processes data locally.

About Blowfish Encrypt/Decrypt

Blowfish Encrypt/Decrypt is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.