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Advisory: We only operate services from the RANDOM.ORG domain. Other sites that claim to be operated by us are impostors. If in doubt, contact us.
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.
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
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
Multi-Round Giveaway Service for verified video
giveaways
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
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
DNA Protein
Sequence Randomizer (at Bio-Web)
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
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
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
FAQ contains answers to frequently asked questions
Newsletter appears at random intervals, but do sign
up
Contact Details in case you want to get in touch