Number Base Converter

Number Base Converter is a free browser-based tool that helps you convert between binary, octal, decimal, and hex. It is part of ToolsMonk's converters collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.

This tool is especially useful for workflows such as converting a hex colour or memory address to decimal and back, checking the binary representation of a number while learning or debugging, and translating between bases for low-level programming and bitwise work. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.

Number Base Converter is designed for people who want a practical, privacy-friendly workflow with instant results inside the larger ToolsMonk library.

Number Base Converter translates a number between binary (base-2), octal (base-8), decimal (base-10), and hexadecimal (base-16), showing all representations at once. They're simply different notations for the same value, so conversion is exact and lossless.

The reason these bases matter is computing. Binary is how machines store everything, but it's unwieldy to read; hexadecimal is the compact human-friendly shorthand, because each hex digit maps exactly to four binary bits. That's why you see hex in colour codes like #FF8800, memory addresses, and byte values.

Hexadecimal extends the single digits past 9 using A–F for 10–15, letting one character cover values 0–15 — exactly four bits. Understanding that mapping makes reading bytes and bitmasks far easier, which is the practical payoff of the tool for developers and CS students alike.

Conversion runs in your browser with nothing uploaded, and copies any representation in one click. Pair it with the other ToolsMonk developer tools for encoding, hashing, and formatting alongside base conversion.