Tool
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases.
Developer Tools
What this tool does
Convert integers between base 2, 8, 10, and 16 with optional 0x/0b prefixes on output.
How to use
- Enter a number.
- Choose from and to bases.
- Copy the converted result.
Examples
255 decimal to hex
Input: 255
Output: 0xFF
255 in base 10 equals FF in hexadecimal.
Common use cases
- Debug hex memory addresses
- Convert binary flags to decimal
- Translate color hex values
FAQ
Can I use 0x or 0b prefixes?
Yes. Prefixes are recognized on input and added on output when helpful.
Does this support negative numbers?
This version focuses on non-negative integer conversion.
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Last reviewed: 2026-05-23