What is Number Base Converter?
Convert integers between binary, octal, decimal, hexadecimal and any arbitrary base from 2 to 36, all at once. Enter a value indicating its input base and instantly get its representation in all the others, ready to copy.
It uses arbitrary-precision arithmetic (BigInt), so it works correctly even with huge numbers that would overflow a normal integer. It's useful for low-level programming, bit manipulation, hexadecimal colors, or any task that crosses number systems.
Frequently asked questions
How do I convert from hexadecimal to decimal?
Enter the number with base 16 selected and you will instantly see its decimal, binary, octal and any base 2–36 value.
What is base 16?
The hexadecimal system: it uses 16 digits (0–9 and A–F). One hex digit represents exactly 4 bits.
What is the highest base supported?
Any base from 2 to 36, using arbitrary-precision arithmetic (BigInt) for huge numbers.
Is it free?
Yes, all NewKit tools are completely free.
Is my data sent to a server?
No. Processing happens 100% in your browser, so it is safe even for sensitive data.