Length, weight & temperature, instantly.
Percentages, ratios & percent change.
Built with privacy in mind. All processing happens entirely in your browser using open-source libraries.
A number base converter translates a value between binary, octal, decimal, and hexadecimal in real time. Type into any field and the other three update instantly, which turns what is normally a tedious, mistake-prone calculation into something you barely have to think about. Each result comes with a copy button, ready to paste into code.
Each base exists for a reason. Binary is the language of hardware, decimal is the one we think in, and octal and hexadecimal are compact ways to represent binary values that humans can actually read. When you are setting up network masks, reading memory addresses, or writing low-level code, the ability to see the same number in multiple representations side by side makes the pattern obvious. Hand conversion is where errors creep in — one arithmetic slip changes the entire value — which is exactly why an automatic converter is worth using every time.
This converter is deliberately simple: no buttons to press, no modes to choose, just four linked fields that stay in sync as you type. Everything runs locally in your browser, so it works even on a machine without an internet connection, and nothing you type is transmitted anywhere.
The real-time link between bases also makes it a great learning aid: type a decimal number and watch it appear in binary, then see why the octal and hex representations are just grouped shorthand. That visual connection is what makes binary and hex finally click for new programmers.
The real-time feedback also catches mistakes the moment they happen. Type a digit that is invalid for a base, such as a 9 in octal or a G in hexadecimal, and the tool flags it immediately, so you learn the constraints of each representation as you work rather than discovering them in a failed compile later.
Who is it for? Programmers translating between representations, students learning number systems, electronics hobbyists, and network engineers working with IP addresses and masks.
Anyone who writes low-level code, configures networks, or debugs hardware ends up converting between bases constantly, and hand conversion is both slow and unreliable. A single slip in long division changes the entire value, which is the last thing you want when a subnet mask or a memory address is on the line. Seeing all four representations at once removes the arithmetic entirely.
For students, the tool doubles as a learning aid: type a decimal number and watch its binary, octal, and hexadecimal forms appear, revealing how each base is just grouped shorthand for the same value. Because the conversion is instant and local, it works offline and never transmits the numbers you are working with, which is useful when a question involves internal identifiers or configuration details.
Yes, free with no signup or limits.
No. Conversion happens locally in your browser.
No. No files are involved, so no limits apply.
Yes, it works on any modern phone.