XOR Cipher

XOR your text with a key to get hex output — decrypt with the same key.

Key (repeated across the message)

Plain text

Result

How XOR works

Each byte of your message is XORed with a byte of the key (the key repeats when it is shorter than the message). XOR is its own inverse, so encrypting with the same key again gives back the original. Output is shown as hex. Reusing a short key on long or multiple messages is insecure — XOR is a teaching cipher, not production encryption.

Free Online Tool

How to Use Examples Related Tools

How to Use XOR Cipher

Pick Encrypt (text to hex) or Decrypt (hex to text).
Enter a key — it repeats across the whole message when shorter.
Type your message; the XOR result appears instantly as hex (or decrypted text).
XOR is symmetric: the same key both encrypts and decrypts.

Examples

Encrypt — input:

HELLO (key: KEY)

Output:

030015070a

Decrypt — input:

030015070a (key: KEY)

Output:

HELLO

Wrong key — input:

030015070a (key: BAD)

Output:

garbled bytes

Features

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