Number Base Converter
Convert numbers between decimal, hexadecimal, binary, and octal instantly online. Free number base converter tool. No signup required.
Decimal Input
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How to Use the Number Base Converter
- Select the input base using the Dec / Hex / Bin / Oct toggle.
- Enter your number in the input field.
- All four representations appear instantly below.
- Click Copy next to any row to copy that value.
- Use Load Example to see a sample conversion (255 in decimal).
Common Number Systems
- Decimal (Base 10) — everyday numbers using digits 0–9
- Hexadecimal (Base 16) — uses 0–9 and A–F; common in color codes, memory addresses, and bytecode
- Binary (Base 2) — uses 0 and 1; the native language of computers
- Octal (Base 8) — uses 0–7; used in Unix file permissions