Designed for very large integers
JavaScript numbers become unreliable beyond 9,007,199,254,740,991. This converter parses each digit directly into a BigInt, so large identifiers, bit masks and cryptographic-sized integers remain exact.
Try an example
Load a value and convert it.
Digits depend on the base
Base 2 accepts only 0–1, octal accepts 0–7, decimal accepts 0–9, and hexadecimal adds A–F. Bases up to 36 use A–Z, with letter case treated equally.
Negative integers supported
A leading minus sign is preserved across conversions. The binary visualization shows the magnitude—not a fixed-width two’s-complement encoding, which requires choosing a bit width.
Number-base conversion FAQ
Can I convert fractional numbers?
This tool intentionally handles integers only so every result is exact. Fractions can repeat indefinitely in another base and require a chosen rounding precision.
What is hexadecimal used for?
Hexadecimal compactly represents binary data and is common in colors, memory addresses, byte values, Unicode code points and debugging.
Are my values uploaded?
Conversion happens locally in your browser. A usage event is recorded when you submit a conversion to enforce your ZeeSharp plan.