Set the range
Enter the lowest and highest number, for example 1 to 500.
Random numbers
A random number generator you can actually check
Choose the range and how many numbers you need. They come out at random, with no repeats, plus a public seed so anyone can verify the result.
Free, no sign-up. Ranges of up to 10,000 numbers and up to 100 results at a time.
- No repeats
- Free, no sign-up
- Verifiable public seed
Generate your numbers
Your numbers will show up here, with their public seed.
01What it is
Random numbers, with proof
A random number generator picks one or more numbers within a range, for example 1 to 100. Use it to draw assigned numbers, set a turn order, choose questions or play games.
On Cuki every generation uses a public seed and the same engine as our draws. With the seed and the range, anyone can repeat the calculation and get exactly the same numbers: there's no way to hand-pick them.
- Number draws
- Turn order
- Classrooms and games
- Home bingo
- Picking questions
02How it works
Four steps, one minute
Everything happens in your browser, on phone or computer.
Choose how many
Up to 100 numbers at a time. They never repeat.
Generate
The numbers come out at random in a fixed order, along with the public seed.
Verify if you want
One button repeats the calculation on the server and confirms the result matches.
03Transparency
The seed decides, not us
Every result comes from a 256-bit public seed and the range you chose. With those, anyone can recompute it and reach the same numbers.
See how it's verifiedTruly random, and checkable
Truly random, and checkable
04Why Cuki
No repeats
Each number in the range comes out once, in the order it was picked.
Verifiable
Public seed and the same engine as Cuki's draws: the result can be checked.
Free, no sign-up
Use it right away, without an account or anything to install.
Big ranges
Up to 10,000 numbers per range and up to 100 results at a time.
05FAQ
Common questions
Anything else? Write to hola@cuki-sorteos.com.
Is it free?
Yes. The random number generator is free and needs no sign-up.
Can numbers repeat?
No. Each number in the range can come out only once per generation.
Can I reveal the numbers with a countdown?
Yes. Choose "With a countdown" and 3, 5 or 10 seconds. The result is fixed when you tap Generate, with its public seed; the countdown only shows it afterwards, which works well for revealing it live.
How do I know the numbers are random?
Every result comes from a public seed generated on the spot. With the seed and the range, the verify button repeats the calculation on the server.
What's the largest range?
Up to 10,000 numbers per range, for example 1 to 10,000, and up to 100 results at a time.
Can I use it for a giveaway?
Yes, if each entrant has an assigned number. If you have the list of names, the random name picker saves you the numbering step.
Does it work on my phone?
Yes. It works in any browser, on phone or computer.
Got names instead of numbers?Use the random name picker
Drawing with names instead?
Paste the entrants, choose how many win and announce with a social card and video.