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 your range and written in base 16 with a leading 0x, alongside the decimal value it came from. Width is not padded — a small value in range prints as a short hex string, the same way it would in decimal.

Limitations and good to know

• The prefix is always 0x. # and a bare value are also common in different contexts and are not offered here.
• Width is not padded to a fixed number of digits, so values of different sizes print at different lengths.
• Digits are shown in one case throughout. Hex is case-insensitive, and mixing cases makes comparison harder for no gain.
• The range stops at 9,007,199,254,740,991 — 1FFFFFFFFFFFFF, fourteen hex digits — which is the largest whole number a browser's ordinary number type holds exactly, so nothing longer can be drawn here.
• The minimum cannot go below 0. A negative value has no agreed hex notation to show alongside a 0x prefix, so the range here is unsigned only.