Random Hex Number Generator

What this generator does

Produces a random number in base 16 with its decimal equivalent, for number-base practice and for testing hexadecimal parsing.

How to use this tool

1. Set a minimum and maximum.
2. Press generate for a random number shown in hex and decimal.

Worked examples

Format

0x2F9 (decimal 761)

Common use cases

• Computer science teaching examples
• Practising decimal-to-hex conversion
• Generating test values for code or colour work

How this generator works

A value is drawn uniformly across the range the digit count allows and written in base 16, with leading zeros kept so the width is constant. Constant width is the useful property: hexadecimal is almost always read as a fixed-size field — two digits to a byte — and a value that shrinks when it happens to be small is much harder to scan in a column.

Limitations and good to know

• No prefix is added. 0x, # and a bare value are all common and none is universal.
• Digits are shown in one case throughout. Hex is case-insensitive, and mixing cases makes comparison harder for no gain.
• Values beyond about fifteen hex digits exceed what a browser's ordinary number type represents exactly, so treat long ones as strings.