---
title: "Number Base Converter - Binary, octal, decimal, and hexadecimal conversion"
description: "Convert integers between binary, octal, decimal, and hexadecimal. Enter a value in any field and the other bases update. Useful for checking bit masks, memory addresses, color codes, and values larger than 64 bits."
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> Index of every page on this site: [llms.txt](https://web-toolbox.dev/llms.txt)

# **Number Base Converter**

Convert between binary, octal, decimal, and hex

**Binary**

**Octal**

**Decimal**

**Hexadecimal**

## What is Number Base Converter?

Number Base Converter converts integers between binary, octal, decimal, and hexadecimal. Enter a value in any field and the other bases update. It is useful for checking bit masks, memory addresses, color codes, and values larger than 64 bits.

## How to Use

1. Enter an integer in the binary, octal, decimal, or hexadecimal field. Values with a `**0b**`, `**0o**`, or `**0x**` prefix, and values separated by spaces or commas, can be pasted as they are.
2. Review the converted values in the other fields.
3. Toggle Group digits as needed.

## Main Settings

### Group Digits

This setting adds separators to long values. When it is on, binary and hexadecimal are grouped by 4 digits from the right, and octal and decimal by 3. Decimal uses commas; the other bases use spaces. Turn it off when you need the value without separators.

## Use Cases

- Checking values with prefixes such as `**0b1010**` and `**0xFF**`
- Reviewing bit masks and flag values in binary
- Comparing hexadecimal memory addresses or color codes with decimal
- Checking octal values such as UNIX permissions
- Converting large integers, including values larger than 64 bits

## Things to Keep in Mind

- Only integers are supported. Fractions and exponent notation are not converted
- Negative numbers are not supported. Values are treated as unsigned integers; sign and bit width are not interpreted

**How was your experience?**

Last updated: October 27, 2026

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