Number Base Converter

Convert binary, octal, decimal, hexadecimal, and base36.

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Built by Derar Sattouf

Number Base

Input

Output

Binary11111111
Octal377
Decimal255
HexadecimalFF
Base3673

What is the Number Base Converter?

The Number Base Converter translates integers between binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16) and base36. It uses BigInt arithmetic, so even 64-bit and larger values convert exactly, which helps with bit flags, memory addresses, color values and compact IDs.

How to use it

  1. Enter a number in any supported base.
  2. Read the value in every other base.
  3. Copy the one you need.

Features

  • Binary, octal, decimal, hex and base36
  • Exact BigInt precision
  • Live conversion as you type

Frequently asked questions

How do I convert hexadecimal to decimal?

Type the hex value, for example ff, in the hexadecimal field and the decimal field shows 255. All other bases update at the same time.

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Last updated: October 2026 · Built by Derar Sattouf