Number Base Converter
Convert numbers between decimal, binary, hexadecimal, octal, and any base from 2 to 36. Supports large numbers and shows conversion steps.
Custom Base
Frequently asked
questions
Type your decimal number in the Decimal field and the binary equivalent appears instantly. For example, 255 in decimal = 11111111 in binary = FF in hex = 377 in octal.
Hexadecimal (base 16, using digits 0–9 and A–F) is widely used in programming for memory addresses, color codes (e.g. #FF5733), and byte values because each hex digit maps to exactly 4 binary bits.
The tool uses JavaScript's BigInt for large number support, so you can convert very large integers accurately without floating-point errors.