Binary Cipher Tool
Convert text to binary and back using the four cipher tricks most common in real CTF challenges — Standard, Reverse, XOR, and Bit-Shift. Runs 100% in your browser. No signup, completely free.
Plain text ⇄ binary — no cipher applied.
Message or Binary
0 characters
Result
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What is a Binary Cipher Tool?
A binary cipher tool converts regular text into binary (0s and 1s) and back again — while supporting the exact tricks used in real Capture The Flag (CTF) challenges. Unlike basic converters that only do plain ASCII → binary, this tool handles the four most common CTF binary puzzles in one click:
- Standard Binary — normal text-to-binary conversion (e.g. “Hello” → 01001000 01100101 …)
- Reverse Binary — flips the entire bitstream backwards, a classic easy CTF twist
- XOR Cipher — encrypts and decrypts using any repeating key you choose; the same key works both ways
- Bit-Shift Cipher — performs a true circular shift inside each 8-bit byte (not a letter Caesar shift) — exactly what most crypto challenges expect
Everything runs 100% in your browser — nothing is sent to a server, no tracking, no ads.
How to Use It (30-Second Guide)
- Type or paste your message (text or binary) in the big box.
- Pick a cipher mode:
- Standard Binary → plain conversion
- Reverse Binary → no extra settings needed
- XOR Cipher → type any key (word, phrase, number)
- Bit-Shift Cipher → enter a number from -7 to 7
- (Optional) Keep “Add spaces every 8 bits” checked for readability.
- Click Encode to Binary or Decode from Binary.
- Use Copy Result (with spaces) or Copy Raw Binary (no spaces) depending on what the challenge wants.
That’s it. You now have the fastest, most accurate free tool for solving binary puzzles in CTFs, homework, or just sending secret messages to friends.