All Number Converter

All Number Converter – Every Base at Once

This all numbers converter shows one value in decimal, binary, octal, hexadecimal, and a custom base of your choice side by side. Type into any field and every other field updates immediately, so you never have to pick a "from" and "to" direction first. It is the quickest way to check what 0xFF, 0b1010, or 755 really mean.

Which number systems are supported?

• Decimal (base 10) – the everyday system with the digits 0–9.
• Binary (base 2) – ones and zeros, the language of CPUs, bit masks, and network masks.
• Octal (base 8) – digits 0–7, still used for Unix file permissions such as chmod 755.
• Hexadecimal (base 16) – digits 0–9 and A–F, used for memory addresses, colors, and byte dumps.
• Custom base 2–36 – pick any radix, for example base 36 for short IDs (zz = 1295) or base 3 and base 5 for math homework.

Big numbers and fractions

The converter uses arbitrary-precision integers, so a 64-bit value such as 18446744073709551615 or a 128-bit key converts exactly, without the rounding errors you get from ordinary floating-point calculators. Fractions are supported as well: 10.5 in decimal becomes A.8 in hex and 1010.1 in binary. Fractions that do not end in the target base (like decimal 0.1 in binary) are shown with up to 24 digits.

Input tips

You can paste prefixes (0x, 0b, 0o), a leading minus sign, and digit groups separated by spaces or underscores, e.g. 1111 0000 or 1_000_000. Hex digits are accepted in upper or lower case. The chips below the fields show how many bits and bytes the number needs, which helps when you size a variable or a database column.

Need to convert whole lists instead of a single value? Use a dedicated converter such as Decimal to Hex or Binary to Decimal, which work line by line.