XOR Encrypt/DecryptEncrypt and decrypt text using XOR cipher with a repeating key.
XOR Encrypt/Decrypt
Encrypt and decrypt text using XOR cipher with a repeating key.
Enter Input
Type or paste your input.
View Output
Results appear in real time.
Copy Result
Click Copy to copy the output.
What Is XOR Encrypt/Decrypt?
XOR cipher is the simplest symmetric encryption — each byte XORed with key byte. Self-inverse. Message-length random key = unbreakable one-time pad. Short keys easily broken. Fundamental building block of modern ciphers. Pure JavaScript, hex output.
Why Use Our XOR 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
Bit-level XOR: 0^0=0, 0^1=1, 1^0=1, 1^1=0. Each byte XORed with key byte cycling via modulo. Hex output. Vulnerable to Kasiski, frequency analysis. Secure only as one-time pad.
Tips & Best Practices
- 1All processing happens in your browser
- 2Results are deterministic for the same input
- 3Use Copy button to quickly grab output
- 4Works on mobile devices with touch-friendly interface
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Encoding & CryptoFrequently Asked Questions
QIs this tool free?
QIs my data secure?
QDoes it work on mobile?
QWhat browsers are supported?
QCan I use this offline?
About XOR Encrypt/Decrypt
XOR 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.