Binary Decimal Hex Number Base Converter

Binary decimal hex

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal.

Value

Input base

Binary11111111Octal377Decimal255HexFF

Usage guide

Convert integers between binary, octal, decimal, and hexadecimal

Number-base conversion is useful when moving between human-readable decimal values, binary bit patterns, Unix permissions, color values, memory addresses, and low-level debugging output. The value stays the same while its digit representation changes.

How to use Number Base Converter

1.Choose the base of the value you already have and enter only digits valid for that base.
2.Convert the number and compare its binary, octal, decimal, and hexadecimal representations.
3.When using the result in code, add any language-specific prefix such as 0x only where the destination syntax requires it.

Examples

Decimal 255 becomes hexadecimal FF and binary 11111111.
Binary 1010 becomes decimal 10 and hexadecimal A.
Octal permission values can be examined alongside their decimal or binary representation for debugging.

Limitations and notes

Very large integers can exceed the exact numeric range of ordinary JavaScript numbers if a tool does not use arbitrary-precision arithmetic.
Signed values, floating-point formats, and two's-complement interpretation are separate topics from simple unsigned base conversion.