Number Base Converter
Convert between binary, octal, decimal, and hex.
🔢 Common uses: programming (hex colors, memory addresses), digital electronics (binary), and file permissions (octal). Try 255 in decimal = FF in hex.
What Is This Tool?
This tool converts numbers between four bases: binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). These are the number systems used in computing.
Why Different Bases Exist
- Decimal — what humans use daily (10 fingers)
- Binary — how computers store data (on/off electrical signals)
- Hexadecimal — compact way to represent binary (4 bits = 1 hex digit)
- Octal — historical Unix file permissions, less common today
Common Uses
- Hex colors in web design: #FFFFFF = 255,255,255 in decimal
- Memory addresses shown in hex by debuggers
- File permissions on Unix: chmod 755 (octal)
- Network masks and MAC addresses
- Binary logic in electronics and computer science class
Quick Reference
- Decimal 255 = FF hex = 11111111 binary
- Decimal 16 = 10 hex = 10000 binary
- Decimal 8 = 10 octal = 1000 binary
Frequently Asked Questions
Why do programmers use hexadecimal?
Because one hex digit represents exactly 4 binary digits (a "nibble"). This makes long binary numbers much shorter and easier to read. FF is more compact than 11111111.
About the Number Base Converter
The Number Base Converter converts binary converterfrom one unit to another using the exact internationally defined conversion factors. Type a value, choose your source and target units, and the converted result is shown instantly — no waiting, no page reload.
Manual conversion is error-prone because it means memorizing ratios (how many feet in a meter, how many pints in a liter). This tool removes that friction: the conversion factor is built in, and the math is done to full precision with no rounding until the final displayed number.
How to Use This Tool
- Enter the value you want to convert in the input field.
- Select the unit you are converting from.
- Select the unit you want to convert to.
- The converted value appears instantly. Adjust either unit to compare across the board.
- Copy the result if you need it elsewhere. Your input is never sent anywhere.
Why Use an Online Converter?
Browser-based tools like this one have a few real advantages over installed software or manual methods:
- No installation. It opens instantly in any browser, on any operating system.
- Private by default. Everything runs locally, so your data stays on your device.
- Always up to date.There's nothing to update — you always get the latest version when you load the page.
- Free and unlimited. Use it as often as you like, with no account and no caps.
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