Decimal to HEX Conversion

Convert between decimal and hexadecimal (HEX)

Features

Supports batch conversion of multiple values

Process values together, separated by spaces, line breaks, or commas

Converts huge integers accurately

Processes large numbers that a calculator cannot handle, without rounding errors

Output format switching

Choose uppercase output and whether to add the 0x prefix

Auto-handles full-width digits and negatives

Full-width input is auto-corrected to half-width, and negative values are converted too

How to use

Select the conversion direction

Use the buttons at the top to choose decimal-to-hex or hex-to-decimal

Enter the value to convert

Type a value in the input field. You can also load an example with the sample button to try it out

Set the output options

For decimal-to-hex, toggle "Output in uppercase" and "Add 0x prefix"

Get the result with the convert button

Press "Convert" to display the result. Use the copy button to use it right away

Use cases

Learning programming

Quickly check your answers for base conversions in class or self-study

Checking color code values

Convert decimal RGB values to hex and apply them to CSS color settings

Analyzing logs and memory values

Grasp hexadecimal error codes and memory addresses in decimal

Checking values in embedded development

Cross-check register settings and sensor output in both hex and decimal

Basic Knowledge

How to Convert from Decimal to Hexadecimal

Divide a decimal number by 16 and arrange the remainders from bottom to top to get the hexadecimal number. For example, 255 is 255 ÷ 16 = 15 remainder 15, and since 15 corresponds to F, it becomes FF.

How to Convert from Hexadecimal Back to Decimal

Multiply each digit by the corresponding power of 16 and add them together to convert back to decimal. For example, 1A3 is 1 × 256 + 10 × 16 + 3 = 419.

What Do A–F Mean in Hexadecimal?

Since hexadecimal must represent values from 0 to 15 in a single digit, letters A–F are assigned to 10–15, which exceed 9. Whether written in uppercase or lowercase, they represent the same value.