Hexadecimal colors, binary permissions, octal file modes — different number bases appear throughout programming. Understanding how to convert between them isn't just academic; it's a practical skill for debugging, systems programming, and understanding how computers store data.
What Is Number Base Converter?
Number base conversion translates a value from one positional numeral system to another. Our Number Base Converter handles binary (base-2), octal (base-8), decimal (base-10), hex (base-16), and any custom base up to 36.
How to Use Number Base Converter on DevToolHub
- Open the Number Base Converter tool on DevToolHub — no signup required.
- Paste or enter your input data in the left panel.
- See the result instantly in the output panel.
- Copy the result or download it as a file.
Converting Between Common Bases
See the same number in different representations:
// Decimal 255 in every common base:
Binary (base-2): 11111111
Octal (base-8): 377
Decimal (base-10): 255
Hex (base-16): FF
// Where you see each base:
Binary: chmod bits, network masks, bitwise ops
Octal: Unix file permissions (chmod 755)
Decimal: everyday numbers, most programming
Hex: colors (#FF0000), memory addresses, byte valuesPro Tips
- Group binary digits in 4s (1111 0000) for easier hex conversion — each group is one hex digit
- Octal is mostly used for Unix permissions: 7=rwx, 5=r-x, 4=r--
- Prefix conventions: 0b (binary), 0o (octal), 0x (hex) in most programming languages
- Each hex digit represents exactly 4 bits — that's why a byte is two hex digits
When You Need This
- Understanding Unix file permissions in chmod commands
- Working with memory addresses and pointers in C/C++
- Debugging network subnet masks and IP addresses
- Converting color values between hex and RGB decimal
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