Free Number Base Converter
Convert numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). See all 4 formats simultaneously. No signup required.
100% free — no account needed
Examples
Free Number Base Converter Features
Binary, octal, decimal, and hex in one view
Simultaneous Display
See your number in all 4 formats at the same time.
4 Number Bases
Binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16).
Common Examples
Quick-load values like 255, 128, ASCII codes, and color values.
Quick Swap
Swap from and to bases with one click.
FAQ
When do I need binary?
Binary is used in bitwise operations, network masks, file permissions, and understanding how computers store data at the lowest level.
Why is hex used for colors?
Hexadecimal maps cleanly to binary (each hex digit = 4 bits). Two hex digits represent a byte (0-255), perfect for RGB color channels.
What about base 64?
Base 64 uses a different encoding scheme (letters + numbers + symbols). Use our Base64 Encoder tool for that conversion.
More Conversion Utilities
Unit converter, color converter, timestamp converter, and more.