How to Convert Binary to Decimal and Hex (Number Base Converter)

Published 5 November 2026 by Kloora Tools

Quick answer: use the free Number Base Converter to convert numbers between binary, octal, decimal and hexadecimal. It runs in your browser, so nothing you enter is uploaded or stored, and there is no signup.

What is the Number Base Converter?

Convert numbers between binary, octal, decimal and hexadecimal. People often search for it as "binary to decimal", "decimal to binary" or "hex to decimal". This free version works on any phone or computer and needs no download.

How to use the Number Base Converter

Open the Number Base Converter.
Enter your values in the fields.
The results update instantly as you type.
Note or copy the numbers you need.

How it works

Each digit in a base is multiplied by a power of that base. In binary, 1011 = 8 + 0 + 2 + 1 = 11. The tool reads your number in the base you pick and shows binary, octal, decimal and hexadecimal.

Worked example

Input: Number: 255; Input base: Decimal (10)
Result: Binary: 11111111; Octal: 377; Decimal: 255; Hexadecimal: FF

Common uses

Study computer science and networking
Convert hex color or memory values
Check binary homework answers

Second worked example

Here is the same tool with larger numbers, so you can see how the result scales.

Input: Number: 255; Input base: Decimal (10)
Result: Binary: 11111111; Octal: 377; Decimal: 255; Hexadecimal: FF

Tips for the best result

Read the labels carefully and use the same unit for every value.
Try the default example first to see how the tool behaves.
Change one input at a time to see how it affects the result.
Write down or copy the result before you leave the page.

Common mistakes to avoid

Mixing units, such as metres in one field and feet in another.
Entering a value in the wrong field.
Treating a result as exact when the inputs were rough estimates.
Not allowing a safety margin for waste, error or change.

Number Base Converter compared with doing it by hand

	Number Base Converter	By hand or in a spreadsheet
Speed	Instant, results update as you type	Slow, you rebuild the steps each time
Accuracy	Same standard method every time	Easy to slip on a formula or a unit
Privacy	Runs in your browser, nothing uploaded	Depends on the software you use
Cost	Free, no signup	Free or paid software needed

Try it now

Open the Number Base Converter and try your own numbers or text. If it helps, share it with someone who needs it.

Try it now: Number Base Converter. Convert numbers between binary, octal, decimal and hexadecimal.

Frequently asked questions

How do I convert binary to decimal?

Choose Binary as the input base, type the number and read the decimal result.

Does it handle large numbers?

It works with whole numbers up to about 9 quadrillion.

What does the Number Base Converter do?

Convert numbers between binary, octal, decimal and hexadecimal.

How do I use the Number Base Converter?

1. Enter your values in the fields. 2. The results update instantly as you type. 3. Note or copy the numbers you need.

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

Yes. Everything runs in your browser on your own device. Nothing you type or choose is uploaded, stored or shared, and no AI service is used.

Does the Number Base Converter work on a phone?

Yes. It works on phones, tablets and computers in any modern browser, with nothing to install.

Do I need an account or a payment to use the Number Base Converter?

No. It is free, has no daily limit, no watermark and needs no signup.

What information does the Number Base Converter need?

You enter: Number, Input base. The results update instantly as you change any value.

How does the Number Base Converter work?

Each digit in a base is multiplied by a power of that base.

Can I use this for "decimal to binary"?

Yes. The Number Base Converter is built for exactly that, and it also answers searches such as "binary to decimal" and "hex to decimal".

How accurate is the Number Base Converter?

It uses the standard method and shows results to a sensible precision. For legal, medical, financial or safety decisions, confirm important numbers with a qualified professional.

Where can I find more free tools like the Number Base Converter?

Kloora Tools has over 150 free tools for CVs, PDFs, images, Urdu, calculators and everyday tasks. Browse them all from the home page.