Number Base Converter

The Number Base Converter is a fast, browser-based tool that lets you convert any integer between the four most common numeral systems: binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Enter a value in any base and instantly see its equivalent representation in all others — no manual arithmetic, no lookup tables, no mistakes.

For developers, understanding and translating between number bases is a daily reality. Whether you are reading memory addresses in a debugger, setting file permissions on a Unix system, defining color values in CSS, or interpreting bitfield flags in an embedded system, you constantly need to move between representations. This tool eliminates the mental overhead and reduces the risk of transcription errors, letting you stay focused on your actual problem.

Using the converter is straightforward: type or paste a number into any of the four input fields — binary, octal, decimal, or hexadecimal — and all other fields update in real time. There is no submit button to click; conversion happens as you type. Binary input accepts only 0s and 1s, octal accepts digits 0–7, decimal accepts standard integers, and hexadecimal accepts digits 0–9 and letters A–F (case-insensitive).

The tool handles both positive integers and zero. For hexadecimal output, letters are rendered in uppercase by convention, which is standard in most technical contexts such as color codes and memory addresses. Negative numbers and floating-point values are outside the scope of this tool — it is designed specifically for non-negative whole number conversions, which covers the vast majority of real-world base-conversion needs.

Edge cases to be aware of: leading zeros in your input are ignored to avoid ambiguity (for example, entering '010' in the decimal field is treated as 10, not octal 10). Very large numbers are supported up to the safe integer limit of JavaScript, so values up to 2^53 − 1 convert accurately without precision loss.