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Number System Converter — Binary, Octal, Decimal, Hex

Convert numbers between binary, octal, decimal and hexadecimal. Type in any base and instantly see the others.

Binary

0b11111111

Octal

0o377

Hexadecimal

0xFF
About this tool

Why programmers need this

Memory addresses are hex. File permissions on Linux are octal. Bit flags are binary. Most other code is decimal. Going between them by hand is tedious. Pick a base, type the number, see all conversions instantly with proper validation.

How to use the Number System Converter

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the Number System Converter above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the Number System Converter.

Is the Number System Converter free to use?

Yes. The Number System Converteron 7BusyBoss is completely free — no signup, no paywall, no usage cap. We do recommend paid alternatives in a sidebar card, but the core tool stays free.

Do I need to sign up to use the Number System Converter?

No. The Number System Converterworks instantly in your browser — no account needed. Signing in with Google is optional and only unlocks features like saving favorites and higher AI build limits.

Does the Number System Converter work on mobile?

Yes. Every tool on 7BusyBoss is mobile-responsive and works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops.

Is my data safe when I use the Number System Converter?

Yes. The Number System Converterruns entirely in your browser — your inputs never leave your device unless the tool explicitly fetches public data (e.g. currency rates). We don't store the values you type.

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