Blowfish Encryption

This tool preserves a package-specific Blowfish workflow for legacy interoperability. Its output has no authentication tag and should not be selected for a new encryption design. Use the main Encrypt Tool for new passphrase-encrypted text.

1. Enter the text you want to encrypt in the left text area.
2. Type in your chosen passphrase.
3. Click the "Encrypt" button.
4. The encrypted result will appear in the right text area.

Blowfish is a symmetric encryption algorithm developed by Bruce Schneier. It encrypts data in 64-bit blocks and supports key lengths of up to 448 bits. Its 64-bit block size and the lack of authenticated encryption in this tool make it a legacy compatibility choice rather than a current default.

Use this route only when you have tested compatibility with the matching Blowfish implementation. Before relying on the result, record these limits:

• Package-specific format: a generic “Blowfish” label is not enough to guarantee interoperability.
• No authentication tag: decryption does not provide an integrity guarantee comparable to AES-GCM.
• Legacy scope: use only for an existing, tested dependency; choose an authenticated mode for new work.

Blowfish is reversible encryption that requires a passphrase to decrypt. If you need one-way hashing for password storage or integrity checks, use a hashing tool such as Bcrypt or SHA-256.

To reverse the encryption, use the Blowfish Decrypt Tool. Just enter the encrypted text along with the same passphrase you used for encryption.

The Blowfish Encryption Tool can handle a variety of input formats, including:

• Plain text
• JSON and YAML
• XML files
• Configuration and log files
• Source code snippets

These labels describe text representations, not separate security guarantees. Verify that the receiving system uses the same package and passphrase handling.

Appropriate uses for this page are limited to:

• Reproducing an existing Blowfish integration test
• Recovering data from the matching legacy implementation
• Planning a migration to an authenticated format

For more detailed examples and advice, see our Guides section.

If you don't need encryption but want to encode your data, try our Base64 Encode tool.