Number Base Converter
Convert between binary, decimal, hexadecimal, and octal instantly. Type in any field to update all others live.
Only 0 and 1 are valid binary digits.
Only digits 0–7 are valid in octal.
Only digits 0–9 are valid in decimal.
Only hex digits 0–9 and A–F are valid.
Bit Visualization
Click any cell to toggle that bit.
Number Properties
Hex Reference (0–F)
| Decimal | Hex | Binary | Octal |
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Frequently Asked Questions
What is number base conversion?
Number base conversion is the process of expressing the same integer value in different numeral systems. For example, the decimal number 255 equals 11111111 in binary, FF in hexadecimal, and 377 in octal.
How do I convert binary to decimal?
To convert binary to decimal, multiply each binary digit by its corresponding power of 2 and sum the results. For example, 1011 in binary = 1×8 + 0×4 + 1×2 + 1×1 = 11 in decimal.
What is hexadecimal used for?
Hexadecimal (base 16) is widely used in computing for representing binary-coded values more compactly. It appears in HTML color codes, memory addresses, machine code, and network protocols like MAC addresses and IPv6.
Why does the bit visualization panel change size?
The bit visualization automatically expands to accommodate your number — 8-bit for values up to 255, 16-bit up to 65535, 32-bit up to about 4 billion, and 64-bit for larger values. You can also manually select the bit width using the selector buttons.
How does this converter handle large numbers?
This tool uses JavaScript BigInt, which supports arbitrarily large integers. You can convert numbers well beyond the 64-bit range without loss of precision. All computation happens in your browser — nothing is sent to a server.