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Number Base Converter

Convert numbers between Binary, Octal, Decimal, and Hexadecimal instantly

Valid characters: 0-9

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All conversions happen in your browser. No data is sent to any server.

Number Systems

2Binary (Base 2)

Uses only 0 and 1. Foundation of digital computers.

Example: 1010 = 10

8Octal (Base 8)

Uses digits 0-7. Common in Unix file permissions.

Example: 12 = 10

Decimal (Base 10)

Standard number system. Uses digits 0-9.

Example: 10 = 10

16Hexadecimal (Base 16)

Uses 0-9 and A-F. Common in colors and memory addresses.

Example: A = 10

Features

  • Convert between 4 number bases
  • Real-time conversion as you type
  • Input validation for each base
  • One-click copy for each result
  • Color-coded results
  • Prefix notation hints (0b, 0o, 0x)

Common Use Cases

Programming

  • Convert color codes (hex to RGB)
  • Debug bitwise operations
  • Work with memory addresses
  • Understand binary flags

System Administration

  • Convert Unix file permissions (octal)
  • Work with network masks
  • Analyze system logs
  • Debug hardware configurations

Education

  • Learn number systems
  • Computer science courses
  • Digital electronics
  • Verify manual calculations

Web Design

  • Convert hex color codes
  • RGB to hex conversion
  • Work with CSS values
  • Debug color issues

Quick Reference Examples

BinaryOctalDecimalHexadecimal
0000000
10101210A
11111111377255FF
100000000400256100