What does this tool do?
The XOR Cipher tool encrypts text by applying an XOR operation against a key and encodes the result as Base64. It is handy for students learning encryption logic, CTF players, and anyone curious about how a classic symmetric cipher works.
How to use it
- Paste your text into the input area.
- Adjust the options to fit your needs.
- Copy the processed text.
How repeating-key XOR works
The tool performs a bitwise XOR of each character of your text against the characters of the key, repeating the key from the start whenever it is shorter than the text. Because the result can contain raw bytes, the output is converted to Base64 for safe transport. The most interesting property of XOR is that it is symmetric: text encrypted with a key is recovered exactly by switching to 'Decrypt' mode with the same key. If you leave the key empty, the text passes through unchanged.
Security limitations
Repeating-key XOR is an educational and obfuscation toy, not a real security tool. Short or repeating keys are vulnerable to frequency analysis, and the key can be recovered with enough ciphertext. For sensitive data, use a modern algorithm such as AES. This tool is ideal for understanding the basic logic of encryption, solving CTF puzzles, or lightweight data scrambling.
Frequently asked questions
Why is the output in Base64?
Because the XOR operation can produce non-printable bytes, the result is encoded as Base64 for safe copying and transport.
How do I decrypt with the same key?
Paste the Base64 ciphertext, switch to 'Decrypt' mode, and enter the same key; since XOR is symmetric, the original text returns.
Is this encryption actually secure?
No; repeating-key XOR is for learning and obfuscation. Use a modern cipher such as AES for sensitive data.
Is XOR Cipher free?
Yes. XOR Cipher and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. XOR Cipher works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.