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Hex to Decimal Converter

Convert a hexadecimal number to decimal, with binary and octal readouts.

A leading 0x or # is optional. Converted live as you type. Everything runs in your browser.

Hex format

Result

Decimal
255
Hexadecimal0xFF
Binary11111111
Octal377

How to convert hex to decimal

  1. Enter a hex number

    Type or paste a hexadecimal value. A leading 0x or # prefix is optional.

  2. Read the decimal value

    The decimal result appears instantly, along with binary and octal versions.

  3. Copy a result

    Copy the decimal value or any of the other bases with one click.

Why use this tool

Decimal, binary, and octal

Every hex number is shown in base 10, base 2, and base 8 at once so you have every common base in view.

Prefixes handled

A leading 0x or # is stripped automatically, so you can paste color codes and memory addresses as-is.

Handles very large numbers

Long hex strings convert exactly without losing precision, so wide values and hashes stay correct.

Live and forgiving

Conversion happens as you type and spaces are ignored. Invalid digits produce a clear message instead of a wrong answer.

Private by design

All conversion runs on your device. Nothing you type leaves the page. No upload, no signup.

About this tool

Hexadecimal is base 16, using the digits 0 to 9 and the letters A to F. It is everywhere in computing, from color codes and memory addresses to byte dumps, because each hex digit maps neatly to four bits. Reading a hex value back as a normal decimal number by hand means multiplying by powers of sixteen, which this tool does for you the instant you type.

The result also appears in binary and octal, so a single hex value gives you all four common bases at once. A leading 0x or # prefix is stripped automatically, which means you can paste a CSS color like #1A2B3C or a pointer like 0xFF00 straight in without editing it first.

Very long hex strings are handled exactly, so there is no rounding even for wide values. Spaces are ignored and invalid characters are flagged rather than guessed at. To go the other way, use the decimal to hex converter, and for base 2 see the binary to decimal converter or the full number base converter.

Frequently asked questions

How do I convert hex to decimal?
Each hex digit represents a power of sixteen. Multiplying each digit by its place value and adding the results gives the decimal number. This tool does that instantly, so FF becomes 255.
Do I need to remove the 0x or # prefix?
No. A leading 0x, 0X, or # is detected and stripped automatically, so you can paste color codes and addresses without editing them.
Can I convert very long hex values?
Yes. The converter handles arbitrarily long hex strings without losing precision, so wide values and hashes stay exact.
What if I enter an invalid character?
Anything outside 0 to 9 and A to F triggers a short error message rather than a wrong result. Spaces are allowed and ignored.
Is my data sent anywhere?
No. Every calculation happens on your device as you type. Nothing is uploaded and no account is needed.

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