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Convert between binary, octal, decimal, and hex.
Loading Number Base Converter…
One task, zero friction: convert between binary, octal, decimal, and hex. Number Base Converter runs right in your browser as part of ToolsMonk's converters lineup: no installs, no account, and nothing to configure before you start.
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.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Converters |
Enter a number in any base (binary, octal, decimal, or hex)
The equivalent values in the other bases appear instantly
Copy whichever representation you need
Change the input to convert another value
Convert numbers between binary, octal, decimal, and hexadecimal
Instant conversion across all bases as you type
Handles the common bases developers and students need
One-click copy of any representation
Runs in your browser, nothing is uploaded
Free, with no signup and no cap on conversions
Converting a hex colour or memory address to decimal and back
Checking the binary representation of a number while learning or debugging
Translating between bases for low-level programming and bitwise work
Solving computer-science homework involving number systems
Number Base Converter was built so that anyone, professional or first-time visitor, gets what the page promises (convert between binary, octal, decimal, and hex) in seconds. Results are instant and accurate, and nothing needs to be installed or signed up for along the way.
All processing runs locally in your browser, so your files and data never leave your device. The interface adapts to any modern browser and screen size, so the Converters workflow you rely on at a desk is the same one you get on a tablet or phone.
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.
Remember each hex digit equals exactly 4 binary bits, handy for reading bytes and colours at a glance
Use hex for colours and memory addresses, binary for bitwise logic, decimal for everyday maths
Double-check you've entered digits valid for the base (e.g. no '2' in a binary number)
Common questions about this tool, its workflow, and what to expect before you use it.
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Convert between binary, octal, decimal, and hex.
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