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Hex / Decimal / Binary / Octal Converter

Convert numbers exactly between hexadecimal, decimal, binary, and octal.

Input

Private by design: your values never leave your device.

Output

Copy or download conversion as JSON.

Steps

Good to know

The hex/decimal/binary/octal converter converts numbers directly in your browser between bases, with three number models: mathematical integer, fixed bit pattern, or fraction. The source base is automatically detected via prefixes — 0x or # for hex, 0b for binary, 0o for octal; without a prefix, decimal is assumed.

Typical searches include hex to decimal, binary to decimal, and convert number base. Calculation runs locally in the browser. With a fixed bit pattern, the same bit sequence can represent different values as unsigned or signed; with fractions, not every value has a finite representation in every base.

Typical use cases

Convert numeric values between programming languages

Convert hex, binary, or octal values from source code, logs, or debuggers into decimal to better interpret them.

Compare signed and unsigned interpretation

Use the “fixed bit pattern” model with the right bit width to see what value the same bit sequence yields as unsigned or signed.

Represent fractions in other bases

Convert decimal fractions into binary or hex representation, limiting the decimal places if needed when the base representation isn't finite.

Tips for better results

Use prefixes for unambiguous input

Explicitly specify 0x, 0b, or 0o instead of relying on auto-detection when the input would also be valid as a decimal number.

Match the bit width to the actual data source

Set the bit width to the value your system or programming language actually uses (e.g., 8, 16, 32, or 64 bits) to get correct signed values.

How it works

Step by step

  1. 1

    Choose the number model and input

    Choose mathematical integer, fixed bit pattern, or fraction, and enter the number.

  2. 2

    Check source base and options

    Check the automatically detected source base and adjust bit width, interpretation, or decimal places if needed.

  3. 3

    View the result in all bases

    See the result in hex, decimal, binary, and octal at once, and copy it if needed.

Features

Three number models

Choose between mathematical integer, fixed bit pattern, or fraction.

Automatic base detection

Prefixes such as 0x, 0b, and 0o are detected automatically; without a prefix, decimal is assumed.

Local conversion with calculation steps

Calculation happens directly in the browser and shows the individual calculation steps.

Frequently asked questions

How is the source base automatically detected?

Via prefixes: 0x or # for hexadecimal, 0b for binary, 0o for octal. Without a prefix, decimal is assumed.

Why does the same bit pattern give different values?

Because the same bit pattern can represent different values depending on whether it's interpreted as unsigned or signed — choose the matching interpretation and bit width.

Are my inputs uploaded?

No. Conversion runs entirely locally in the browser.

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