Binary & Hex Converter – Convert Binary, Decimal, Hex, Octal
Convert between binary, decimal, hexadecimal, and octal number systems online instantly. Any-field entry updates all bases simultaneously—free, fast, and browser-based.
Runs in your browser
WebAssembly, no server
No signup required
Open and use instantly
Files stay private
Nothing leaves your device
How It Works
Click in the Binary, Decimal, Hex, or Octal input field
Type your number in that base (only valid characters are accepted)
All other fields instantly show the converted values
Key Features
- Simultaneous conversion: binary, decimal, hex, octal update together
- Type in any field — all others auto-update
- Supports large numbers (beyond 32-bit)
- Input validation per number base
- Binary grouping in nibbles (4 bits) for readability
- Hex output in uppercase and lowercase options
- Copy any result to clipboard
- No sign-up required
- 100% browser-based
- Free with no limits
- Mobile-friendly
About This Tool
Our Binary & Hex Converter handles all number base conversions in a single tool — binary (base-2), decimal (base-10), hexadecimal (base-16), and octal (base-8).
All Supported Conversions
- Binary ↔ Decimal
- Binary ↔ Hexadecimal
- Binary ↔ Octal
- Decimal ↔ Hexadecimal
- Decimal ↔ Octal
- Hex ↔ Octal
Quick Reference
| Decimal | Binary | Hex | Octal |
|---------|--------|-----|-------|
| 0 | 0000 | 0 | 0 |
| 10 | 1010 | A | 12 |
| 255 | 11111111 | FF | 377 |
| 256 | 100000000 | 100 | 400 |
Who Uses This Tool
- Computer science students learning number systems
- Developers debugging binary data, bitfields, and flags
- Network engineers working with IP addresses and subnet masks
- Hardware engineers reading register values
- CTF (Capture the Flag) security challenges
Bidirectional Input
Type in any field and all other fields update simultaneously — no need to specify a direction.
Frequently Asked Questions
Enter the decimal number in the Decimal field — the Binary field shows the result instantly.
Type the hexadecimal value (e.g., FF) in the Hex field — the Decimal field shows 255 immediately.
Hexadecimal is used in computing to represent binary data compactly. Colors (#FFFFFF), memory addresses, and byte values are commonly shown in hex.
255 in binary is 11111111 (8 ones). In hex it is FF.
0xFF = 255 in decimal. FF in hex represents 15×16 + 15 = 255.
Yes — completely free with no sign-up.
Yes — JavaScript handles large integers. Note that numbers beyond Number.MAX_SAFE_INTEGER may require BigInt handling.
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