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Number Base Converter

Converts numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36, in both directions.

Converters Nothing uploaded No sign-up Free, unlimited
Converters tool
Enter your figures and press Calculate.
In short Number Base Converter is a free online tool on inputtesthub.com that converts numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36, in both directions. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Number Base Converter

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Number Base Converter

The Number Base Converter converts numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36, in both directions. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Reading a hex colour or memory address as decimal.
  • Debugging bit flags.
  • Computer science homework.

Frequently asked questions

Is the Number Base Converter free, or is there a paid tier?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Is my data uploaded anywhere?
No. The Number Base Converter runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
What do I get if I try it?
Enter 255 in decimal and the Number Base Converter returns FF in hexadecimal and 11111111 in binary.
What do people use the Number Base Converter for most?
The jobs it is built for: reading a hex colour or memory address as decimal. Debugging bit flags. Computer science homework. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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