Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal instantly. Type a value in any base and all other bases update at the same time, which makes it perfect for programming homework, networking, and embedded systems work.

How to use it

  1. Click any of the four input fields: binary, octal, decimal, or hexadecimal.
  2. Type your number in that base; invalid digits are rejected automatically.
  3. Watch the other three fields update live with the converted values.
  4. Copy any converted value with one click for use in your code or notes.

Key features

  • Two-way conversion between binary, octal, decimal, and hex
  • Live conversion as you type, with no submit button
  • Input validation that only accepts digits valid for the selected base
  • Handles large numbers commonly used in programming and networking

Frequently asked questions

What is hexadecimal used for?

Hexadecimal is widely used in programming for memory addresses, color codes, and compact binary representation. Each hex digit maps to exactly four binary digits, which is why it is popular with developers.

Can I convert negative or fractional numbers?

The converter is designed for the integer values used most often in computing tasks. For negatives you can convert the magnitude and apply the sign, or use two's complement in binary manually.

Does 0x or 0b prefix matter?

No, just type the digits themselves. Enter 1A in the hex field rather than 0x1A.