🔢 Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal instantly. Supports large numbers and shows all bases simultaneously. Free online number base converter.

Decimal

0-9

Binary

0-1

Hexadecimal

0-9 A-F

Octal

0-7

How to Use

Enter any number

Type a number into any of the four fields: Decimal, Binary, Hexadecimal, or Octal.

All bases update instantly

The other three fields automatically update with the equivalent value in real-time.

Copy any format

Click the Copy button next to any field to copy that representation to your clipboard.

Frequently Asked Questions

What are the different number bases? +

Decimal (base 10) uses digits 0-9 and is the everyday number system. Binary (base 2) uses only 0 and 1, used by computers. Octal (base 8) uses digits 0-7. Hexadecimal (base 16) uses 0-9 and A-F, widely used in programming for memory addresses and colors.

What does 0x prefix mean in hexadecimal? +

0x is the standard prefix for hexadecimal numbers in most programming languages (C, JavaScript, Python). So 0xFF = 255 in decimal. Similarly, 0b prefix is used for binary (0b11111111 = 255).

How do I convert a hex color code to RGB? +

A hex color like #FF5733 has three pairs: FF (red), 57 (green), 33 (blue). Convert each pair from hex to decimal: FF=255, 57=87, 33=51. Result: rgb(255, 87, 51). Our Color Picker tool does this automatically.

What is the largest number supported? +

The tool handles integers up to JavaScript's Number.MAX_SAFE_INTEGER (2^53 - 1 = 9,007,199,254,740,991). For very large numbers (64-bit+), precision may be limited.

Is any data sent to a server? +

No. All conversions are calculated in your browser using JavaScript's built-in parseInt() and toString() functions. Nothing is sent anywhere.

संपूर्ण गाइड: Number Base Converter