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True Random Number Service

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What’s this fuss about true randomness?

Perhaps you have wondered how predictable machines like computers can generate randomness. In reality, most random numbers used in computer programs are pseudo-random, which means they are generated in a predictable fashion using a mathematical formula. This is fine for many purposes, but it may not be random in the way you expect if you’re used to dice rolls and lottery drawings.

RANDOM.ORG offers true random numbers to anyone on the Internet. The randomness comes from atmospheric noise, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs. People use RANDOM.ORG for holding drawings, lotteries and sweepstakes, to drive online games, for scientific applications and for art and music. The service has existed since 1998 and was built by Dr Mads Haahr of the School of Computer Science and Statistics at Trinity College, Dublin in Ireland. Today, RANDOM.ORG is operated by Randomness and Integrity Services Ltd.

As of today, RANDOM.ORG has generated 1.58 trillion random bits for the Internet community.

Games and Lotteries

Lottery Quick Pick is perhaps the Internet’s most popular with over 280 lotteries

Keno Quick Pick for the popular game played in many countries

Coin Flipper will give you heads or tails in many currencies

Dice Roller does exactly what it says on the tin

Playing Card Shuffler will draw cards from multiple shuffled decks

Birdie Fund Generator will create birdie holes for golf courses

Random Drawings

Q3.1 in the FAQ explains how to pick a winner for your giveaway for FREE

Third-Party Draw Service is the premier solution to holding random drawings online

Step by Step Guide explains how to hold a drawing with the Third-Party Draw Service

Step by Step Video shows how to hold a drawing with the Third-Party Draw Service

Price Calculator tells exactly how much your drawing will cost

Drawing FAQ answers common questions about holding drawings

Public Records shows all completed drawings going back five years

Drawing Result Widget can be used to publish your winners on your web page


Integer Generator makes random numbers in configurable intervals

Sequence Generator will randomize an integer sequence of your choice

Integer Set Generator makes sets of non-repeating integers

Gaussian Generator makes random numbers to fit a normal distribution

Decimal Fraction Generator makes numbers in the [0,1] range with configurable decimal places

Raw Random Bytes are useful for many cryptographic purposes

Lists and Strings and Maps, Oh My!

List Randomizer will randomize a list of anything you have (names, phone numbers, etc.)

String Generator makes random alphanumeric strings

Password Generator makes secure passwords for your Wi-Fi or that extra Gmail account

Clock Time Generator will pick random times of the day

Calendar Date Generator will pick random days across nearly three and a half millennia

Geographic Coordinate Generator will pick a random spot on our planet’s surface

Bitmaps in black and white

Hexadecimal Color Code Generator will pick color codes, for example for use as web colors

Pregenerated Files contain large amounts of downloadable random bits

Pure White Audio Noise for composition or just to test your audio equipment

Jazz Scales to practice improvisation for students of jazz guitar

Samuel Beckett’s randomly generated short prose

Web Tools and Widgets for Your Pages

Integer Widget Wizard will put a mini-RANDOM.ORG on your web page or blog

Draw Widget Wizard will put the result of a paid drawing on your web page or blog

HTTP API to get true random numbers into your own code

Guidelines describe how to avoid getting in trouble

Banned Hosts lists who didn’t behave and have been blocked

Random questions to ask

Learn about Randomness

Introduction to Randomness explains what true random numbers are and why they’re interesting

History explains how RANDOM.ORG started and where it is today

Many Testimonials from folks who have found very creative uses for random numbers

Acknowledgements to all the generous folks who have helped out

Quotations about randomness in science, the arts and in life generally

Media Coverage and Scientific Citations lists popular print and scientific mention of the service

News about the latest additions to the site

Random questions to ask


Real-Time Statistics show how the generator is performing right now

Statistical Analysis explains how you test random numbers for randomness

Bit Tally shows how much randomness has been generated since 1998 (hint: lots!)

Your Quota tells how many random bits you have left for today

Random questions to ask

Contact and Help

FAQ contains answers to frequently asked questions

Newsletter appears quite irregularly, but do sign up

Contact Details in case you want to get in touch

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