Cereio

Base Converter

Decimal (DEC)

Base 10

Binary (BIN)

Base 2
0b

Octal (OCT)

Base 8
0

Hexadecimal (HEX)

Base 16
0x

Base32 (B32)

Base 32

About Base Converter

Our free online Base Converter helps you convert numbers between different numeral systems instantly. Whether you're working with binary for low-level programming, hexadecimal for web colors, or octal for Unix permissions, this tool handles all base conversions accurately.

Key Features

Multiple Bases

Convert between binary (2), octal (8), decimal (10), hex (16), and base32.

Real-time Conversion

All fields update automatically as you type in any input.

Bidirectional

Enter a value in any base and see it converted to all others.

100% Client-side

All conversions happen in your browser - your data stays private.

Copy Support

One-click copy for any converted value.

Error Validation

Invalid characters are detected and highlighted immediately.

How to Use

  1. 1Enter a number in any of the input fields (binary, octal, decimal, hex, or base32).
  2. 2All other fields automatically update with the converted values.
  3. 3Click the copy icon next to any field to copy that value.
  4. 4Use 'Clear All' to reset all fields.

Pro Tips

  • 💡Binary uses only 0 and 1 - perfect for understanding computer logic.
  • 💡Hexadecimal (0-9, A-F) is commonly used for colors (#FF0000) and memory addresses.
  • 💡Octal (0-7) is used in Unix file permissions (chmod 755).
  • 💡Base32 uses 0-9 and A-V, often used in encoding schemes.

Frequently Asked Questions

What are number bases?
Number bases (or radixes) define how many unique digits are used in a numeral system. Decimal uses 10 digits (0-9), binary uses 2 (0-1), hex uses 16 (0-9, A-F).
Why is hexadecimal used in programming?
Hexadecimal is compact (one hex digit = 4 binary bits) and maps perfectly to bytes. It's ideal for representing memory addresses, colors, and binary data.
Can I convert negative numbers?
This tool works with positive integers. For negative numbers in binary, you'd need to use two's complement representation.
What's the maximum number I can convert?
JavaScript safely handles integers up to 2^53 - 1. For larger numbers, precision may be lost.