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Number Base Converter

Convert numbers between Binary (base 2), Octal (base 8), Decimal (base 10), and Hexadecimal (base 16).

Number Base ConverterGratisConvertersRuns in your browser

Works in your browser. What you paste or upload is processed on your device.

Key features of the number base converter

  • Converts between binary, octal, decimal, and hexadecimal
  • Supports custom base conversion (base 2–36)
  • Shows all bases simultaneously for comparison
  • Handles large numbers accurately
  • Explains the conversion steps

How to use the number base converter

  1. Enter your number

    Type the number you want to convert in the input field.

  2. Select the input base

    Choose the base of your input number (binary, decimal, hex, etc.).

  3. See all conversions

    View the equivalent value in binary, octal, decimal, and hexadecimal instantly.

  4. Copy any value

    Click 'Copy' next to any converted value to copy it to your clipboard.

  5. Use in your work

    Use the converted values in your programming, debugging, or calculations.

What is a number base converter?

The Number Base Converter converts numbers between different numeral systems — binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16), and any custom base from 2 to 36. Enter a value in any base and instantly see its equivalent in all other bases.

Numeral system conversion is fundamental in computer science, digital electronics, and low-level programming. Hexadecimal is used in memory addresses, colour codes, and debugging; binary is the foundation of digital computing; octal appears in Unix file permissions.

Why use a number base converter?

Programmers, computer science students, and electronics engineers routinely need to convert between number bases. Rather than performing manual positional arithmetic (which is slow and error-prone), this tool provides instant accurate conversions across all common number bases.

Number base converter: frequently asked questions

Something else? Ask the team

What is hexadecimal?

Hexadecimal (base 16) uses digits 0–9 and letters A–F to represent values 0–15 per digit. It's used in programming for compact binary representation — one hex digit represents 4 binary bits.

What is binary?

Binary (base 2) uses only 0 and 1. It's the fundamental number system of digital computers. Every number, character, and piece of data in a computer is ultimately stored as binary.

What is octal used for?

Octal (base 8) is used in Unix/Linux file permissions (chmod values like 755 or 644) and in some older computer systems. Each octal digit represents 3 binary bits.

Why is hex useful for colours?

CSS hex colour codes (#FF5500) use hexadecimal because each colour channel (R, G, B) can be represented as exactly 2 hex digits (00–FF), mapping to 0–255 in decimal — the 8-bit range of each colour channel.

What is base 36?

Base 36 uses digits 0–9 and letters A–Z. It's used for URL shorteners and compact ID generation because it maximises the information density of alphanumeric strings.

Each one opens on its own page and works straight away, with no sign-up.

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fieldnote.app4,571 credits

Site audit

fieldnote.app · SEO, AEO and GEO

Illustrative data
SEO
82
+6
AEO
64
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GEO
58
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Pages
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Fixesby impact
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