Binary Converter - Convert Binary, Decimal, Hex & Octal Online Free

How to Use the Binary Converter

1. Enter a number in any field — Binary, Decimal, Hexadecimal, or Octal
2. Watch the other fields update automatically in real-time
3. Copy any result with one click using the copy button
4. Edit any field — changing any one field updates all others simultaneously
5. Start fresh — clear all fields and enter a new number in any base

Perfect for programmers, computer science students, and anyone working with different number systems.

Features

• Real-time conversion — updates as you type in any field
• Binary — base-2 input and output
• Decimal — base-10 input and output
• Hexadecimal — base-16 input and output
• Octal — base-8 input and output
• Copy to clipboard — click any result to copy

Use Cases

• Programming — convert hex color codes (#FF5733) to decimal for CSS or decimal to hex for memory addresses
• Computer science homework — verify your manual binary-to-decimal or hex-to-binary conversions
• Networking — convert IP addresses and subnet masks between decimal and binary for subnetting calculations
• Microcontroller work — translate register values between hex, binary, and decimal when configuring hardware
• Debugging — inspect memory dumps by converting between hex and binary representations

FAQ

What number systems are supported?

Binary (base-2), Decimal (base-10), Hexadecimal (base-16), and Octal (base-8).

How does binary conversion work?

Each binary digit (bit) represents a power of 2. Reading right to left, bits represent 1, 2, 4, 8, 16, 32, 64, 128, etc. To convert binary to decimal, add the values of each position that has a 1.

Is there a limit on input size?

Values up to 2^53 are supported safely. Larger values may lose precision due to JavaScript number limitations.

Why do programmers use hexadecimal?

Hex is a compact way to represent binary data. Each hex digit represents 4 bits (a nibble), so an 8-bit byte is just two hex characters. This makes hex much more readable than long binary strings.

How do I convert hex to binary mentally?

Convert each hex digit to its 4-bit binary equivalent. For example, hex A = 1010, hex 3 = 0011, so A3 in hex = 10100011 in binary.

Tips

• Use the binary field to visualize how negative numbers work in two’s complement representation
• For IP subnetting, enter the subnet mask in decimal and read the binary form to see how many bits are used
• Hex values with letters (A-F) are case-insensitive — both “FF” and “ff” work for 255