Random Number Generator

What makes these results fair

Most random tools online use Math.random(), a predictable formula that was never designed for fairness. Everything on this page uses the Web Crypto API instead — the same randomness source browsers use for generating encryption keys — with rejection sampling to remove the subtle bias that naive modulo math introduces. In plain terms: every number in your range has exactly the same chance, and nobody, including us, can predict or influence the result.

Four tools, one honest coin

Numbers gives you any range with one-click presets and a session history. Dice rolls up to six dice with 4 to 100 sides — tabletop players covered from d4 to d100 — and totals them. Coin flip keeps a running heads/tails tally so you can watch the law of large numbers do its slow work. And the list picker takes any list — names for a giveaway, chores, restaurants — and either picks one fairly or shuffles the whole order.

Picking winners people can trust

If you run giveaways or raffles, fairness is only half the job — the other half is being seen to be fair. Announce your method before drawing, use one visible tool, and keep the entry list unedited. Our guide on running fair drawings below covers the simple process that prevents accusations later. For anything regulated (real lotteries, gambling), use certified systems; this tool is for everyday fairness, not licensed gaming.

Guides from Random Number Generator

Longer explainers written for this site. Each one carries a review date.

• How computers fake randomness (and when they don’t) · 5 min read
  Computers are deterministic machines, yet they hand out random numbers all day. The difference between pseudo-random and the real thing.
• How to run a giveaway drawing nobody can call rigged · 5 min read
  Fairness is half the job; being seen to be fair is the other half. A simple process for picking winners that survives angry losers.
• Dice math: why 7 rules the table · 5 min read
  Two dice aren’t twice one die — they’re a bell curve. The probability basics behind board games, craps, and your d20.
• When bad randomness made history · 5 min read
  A draft lottery that wasn’t shuffled, a lottery scammed from the inside, and poker sites cracked by a clock. What broken randomness costs.
• Flip a coin, then check your gut · 4 min read
  Randomness as a decision tool: the coin-flip trick for revealing preferences, when chance beats deliberation, and a famous study on flipped life choices.

See all guides →