Free Online Radix Converter
Convert between binary, octal, decimal, and hexadecimal in one click, with support for arbitrarily large numbers. A daily tool for colors, permissions, and masks.
Key Features
Four-base Conversion
Convert freely between binary / octal / decimal / hexadecimal.
Big Number Support
Uses BigInt for precise conversion of very large values.
One-click Copy
Copy any base's result in one click, ready to use.
Local Computation
All conversion happens locally in the browser.
How to Use
Enter a Number
Type a number in any base, such as 255, ff, or 11111111.
Choose Base
Select the base your input number belongs to.
View Results
All four bases are shown in real time β click to copy.
Frequently Asked Questions
Why do I need radix conversion?
Hexadecimal is often used for colors and memory addresses, and binary for permission bits and bitwise operations β converting between them is a common programming task.
Are negative numbers and decimals supported?
Currently positive integers only. Negative and decimal radix representations are more complex and not yet supported.
How large a number can it convert?
BigInt has no practical precision limit, so it can convert values far beyond the normal integer range.
Do I need to add a 0x prefix for hex?
No. Just type characters like ff or a3 directly; they are parsed as hexadecimal automatically.