Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal with this free Number Base Converter. Enter the original number together with its base type, and the tool instantly shows the equivalent value in all four number systems.

The converter supports:

Number System	Base	Input Format	Example
Binary	2	binary:number	binary:11111111
Octal	8	octal:number	octal:377
Decimal	10	decimal:number	decimal:255
Hexadecimal	16	hex:number	hex:FF

How to Use the Number Base Converter

The converter needs to know the number system of your input. Type the base name, followed by a colon and the number you want to convert.

For example, to convert decimal 255, enter:

decimal:255

The result will be:

Number System	Result
Binary	11111111
Octal	377
Decimal	255
Hexadecimal	FF

You can use the same format for any of the four supported bases:

binary:11111111
octal:377
decimal:255
hex:FF

All four examples represent the same numeric value.

Convert Binary, Octal, Decimal and Hexadecimal

The tool converts a number from its original base into four common numeral systems at the same time.

Binary (Base 2) uses only 0 and 1.

Octal (Base 8) uses digits from 0 through 7.

Decimal (Base 10) is the standard number system using digits from 0 through 9.

Hexadecimal (Base 16) uses 0 through 9 and the letters A through F.

Number Base Conversion Examples

Input	Binary	Octal	Decimal	Hexadecimal
decimal:10	1010	12	10	A
decimal:16	10000	20	16	10
decimal:100	1100100	144	100	64
decimal:255	11111111	377	255	FF

These examples can also be entered from another supported base. For example, hex:FF, octal:377, and binary:11111111 all convert to decimal 255.

Why Do I Need to Specify the Input Base?

Some numbers are valid in more than one number system. For example, 1010 could be interpreted as binary, octal, decimal, or hexadecimal, and each interpretation represents a different value.

Adding the base before the number removes this ambiguity. Use binary:, octal:, decimal:, or hex: followed immediately by the number.

Common Input Errors

Make sure the number contains only characters allowed by its selected base. Binary accepts only 0 and 1, while octal accepts digits from 0 to 7. Decimal uses digits from 0 to 9, and hexadecimal additionally supports the letters A through F.

For example, binary:102 is not a valid binary number because binary cannot contain the digit 2.

Why Use TextNivo’s Number Base Converter?

The Number Base Converter gives you binary, octal, decimal, and hexadecimal values together, so you don’t need to perform separate conversions. It works directly in your browser and lets you copy or download the result when you’re finished.

No account or sign-up is required.

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