Number Base Converter

Convert numbers between decimal, binary, hex and octal.

Different forms, suppliers and countries use different units and formats. Number Base Converter takes enter a number and input base and returns a result you can copy with one click so you do not have to convert by memory.

Decimal, binary, octal and hexadecimal explained

Numbers can be written in different bases. Everyday counting uses base 10 (digits 0 to 9). Computers use base 2 (0 and 1), programmers often use base 16 (0 to 9 and A to F) for compact notation, and base 8 appears in file permissions. This converter changes a number between these bases instantly.

Example: the number 255

  • Binary: 11111111
  • Octal: 377
  • Hexadecimal: FF

How to convert by hand

To go from decimal to binary, divide by 2 repeatedly and read the remainders from bottom to top. To go from binary to decimal, add the powers of two where a 1 appears: 1101 is 8 + 4 + 0 + 1 = 13.

Hex is popular because one hex digit equals exactly four binary digits, so colour codes such as #FF5733 and memory addresses are easy to read. Students can use the tool to check homework answers.

About Number Base Converter

Convert numbers between decimal, binary, hex and octal. Number Base Converter converts in one step instead of looking up a conversion table, keeps the original value so you can double-check the change, and avoids mistakes that come from converting by memory.

Using it

Enter enter a number and input base, then adjust the options so they match what you need, then press the convert button, and finally copy the result and use it where you need it.

Where it comes in handy

You have text or a file in one format and Number Base Converter gets it into the format you actually need.

Farmers, builders and traders who deal in local and standard units and anyone moving content from one format to another commonly use tools of this kind.

Number Base Converter works inside your browser, so what you type or select here is not sent to our server for processing.

At a glance

  • Category: Converters
  • Type: converter
  • You enter: enter a number and input base
  • You get: a result you can copy with one click
  • Works on: phones, tablets and computers, directly in the browser

Quick tips

  • Copy the result straight into your document to avoid typing errors.
  • Check which unit you are converting from and to before pressing the button.
  • Keep a few extra decimals while working and round only at the end.

This page is meant for anyone looking up “binary converter”, “hexadecimal converter”, “binary to decimal”, “decimal to binary”, and “hex to decimal”. Whatever the exact wording, the need is usually the same: a quick, reliable result without extra software.

Frequently asked questions

What does Number Base Converter do?

It is a converter that takes your input on this page and gives you a result you can copy with one click.

What do I need to enter?

You will work with enter a number and input base.

Is this tool what I need if I am searching for “binary converter”?

Yes, if you want a quick answer without installing anything. Searches like this usually come from someone with exactly that need, and the fields on this page are built for it.

Is the tool what I need if I am searching for “hexadecimal converter”?

It can be. Check the fields on this page and the result it gives; if they match what you are trying to do, you are in the right place.

Is my input sent to a server?

No. This tool runs inside your browser, so what you type or select is not sent to our server for processing.

Does it work on a phone?

Yes. The page adapts to phone, tablet and computer screens, so you can use it wherever is convenient.

Related converters and utilities: Roman Numeral Converter, Binary to Text, and Number to Hindi Words.

Further reading from trusted sources

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Last updated: 10 Nov 2026 • 100% free • Mobile friendly

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