Binary Converter

The Binary Converter takes one whole number and shows it in binary, decimal, octal, and hexadecimal side by side. You pick the base your input is written in, type the value, and all four representations appear instantly, each with its own copy button. Everything runs in your browser, so nothing you enter is sent anywhere.

Input Value

Input Base

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Why use Binary Converter?

The Binary Converter is a single-value base converter. You type a whole number into the Input Value field, choose what base that number is written in from the Input Base dropdown (Decimal, Binary, Octal, or Hexadecimal), and it displays the same value in all four systems: Decimal (Base 10), Binary (Base 2), Octal (Base 8), and Hexadecimal (Base 16). There is no Convert button. The four result cards recalculate on every keystroke, and each one carries a Copy button so you can lift a single representation to your clipboard without selecting text manually. A Clear button appears once you have typed something, resetting the field for the next number. The base selector is what makes it flexible in both directions. Because it interprets your digits using the base you chose, the tool doubles as a decoder: set the base to Hexadecimal and type FF to see 255, 11111111, and 377, or set it to Binary and type 1010 to read back ten. If the characters do not fit the selected base, such as the digit 2 under Binary or a stray letter under Hexadecimal, an inline warning appears instead of a result until you fix the entry. Hexadecimal output is always shown in uppercase for easy reading. Two honest limits are worth knowing. First, it converts integers only, so anything after a decimal point is not part of the result. Second, it handles one number at a time; there is no batch conversion and no file upload. The whole operation runs in your browser using standard number parsing, which means the values you test never leave your device and nothing is saved. That makes it well suited to quick, private checks while you are coding, studying number systems, or verifying a value someone handed you in an unfamiliar base.

Key benefits

All four number systems appear together from one entry, so you never run the same value through separate conversions.
Results update live as you type, with no Convert button to press and no page reload.
Each result card has its own Copy button, so you can grab just the binary or just the hex without highlighting text by hand.
The Input Base selector reinterprets the same digits, letting you decode a hex or binary string as easily as a plain decimal number.
Conversion runs entirely in the browser, so the numbers you test never leave your device.

Features

Four simultaneous outputs: Decimal (Base 10), Binary (Base 2), Octal (Base 8), and Hexadecimal (Base 16).
Input Base dropdown to declare whether your entry is decimal, binary, octal, or hexadecimal.
Live conversion that refreshes on every keystroke, with no submit button.
Per-result Copy buttons plus a single Clear button to reset the input.
An inline warning that flags an invalid value for the selected base, for example the digit 2 entered as binary.
Hexadecimal output normalized to uppercase for consistent reading.

Popular use cases

A programmer checking what a color code or bitmask looks like in hex, binary, and octal at the same time.
A student learning number systems who wants to see how the same value maps across all four bases instantly.
An embedded or firmware developer decoding a register value written in hex back into binary bit patterns.
Anyone verifying a binary or octal string by converting it to a readable decimal number and copying the result.

How to use Binary Converter

1
Choose the input base
Open the Input Base dropdown and pick how your number is currently written: Decimal (10), Binary (2), Octal (8), or Hexadecimal (16). Decimal is selected by default.
2
Type your number
Enter the value in the Input Value field. It is read using the base you selected, so 1010 with Binary chosen means ten, while 1010 with Decimal chosen means one thousand ten.
3
Read all four results
The moment the value is valid, four cards appear showing Decimal (Base 10), Binary (Base 2), Octal (Base 8), and Hexadecimal (Base 16). The hexadecimal result is shown in uppercase.
4
Copy or clear
Press the Copy button on any card to put that single representation on your clipboard, or press Clear to empty the field and start a new conversion.

Frequently asked questions

Which number systems can it convert between?

Decimal, binary, octal, and hexadecimal. You select which one your input is written in from the Input Base dropdown, and the tool shows the value in all four at once.

Do I need to press a Convert button?

No. The results recalculate automatically as you type in the Input Value field, so the four outputs update on every keystroke.

Why do I see an 'Invalid value for the selected base' warning?

The characters you entered are not valid for the base you picked. For example, typing 2 with Binary selected, or a letter beyond F with Hexadecimal selected, triggers the warning until you correct the input.

Does it handle decimals or fractions?

No. It converts whole numbers only. The value is parsed as an integer, so a fractional part after a decimal point is not part of the conversion.

Can I convert several numbers in one go?

It works on one value at a time. There is no batch mode or file upload; enter a number, read or copy its four forms, then use Clear to start the next one.

Is my input uploaded to a server?

No. All conversion happens locally in your browser using standard number parsing, so the values you enter are never sent anywhere and nothing is stored.

Last reviewed: July 2026

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