Number Base Converter

Convert numbers between binary, octal, decimal and hex.

Free · Runs in your browser · Last updated 2026-05-03

Binary (base 2)

Octal (base 8)

Decimal (base 10)

Hexadecimal (base 16)

About this tool

Live number base converter for any integer up to 64 bits. Shows binary, octal, decimal and hex side by side.

Privacy

All processing for Number Base happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.

Frequently asked questions

Is the Number Base free to use?

Yes. Number Base is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.

Is my data safe when I use Number Base?

All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.

Does Number Base work offline?

Once the page has loaded, the tool runs entirely client-side. You can disconnect from the internet and it will keep working in the same browser tab.

Which browsers are supported?

Number Base works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.

Do I need to install anything?

No. Number Base runs in any modern web browser with no installation, browser extension, or account required.

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