Private by default
All values and list entries remain in your browser. Nothing is sent to a server or stored after the page is closed.
Random tools
Random number generator
Generate unbiased random integers, draw entries from a list, roll configurable dice or flip one or more coins without sending your data to a server.
Generate a random result
Random result
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Your generated values will appear here.
How the generator works
The page uses crypto.getRandomValues and rejection sampling for integer ranges. Rejection sampling avoids the uneven probabilities that can appear when a random 32-bit value is reduced with a simple modulo.
Available modes
Random integers
Generate one or more integers in an inclusive range, with optional uniqueness and sorting.
List picker
Draw one or more unique or repeatable items from a list.
Dice roller
Roll up to 100 dice with between 2 and 1,000 sides each.
Coin flipper
Flip up to 1,000 coins and count heads and tails.
Important limits
- The generator is not certified for regulated lotteries, gambling, audits, or legally binding drawings.
- A browser extension, compromised device or modified page can affect the result.
- No seed is exposed, so a draw cannot be reproduced later.
- Repeated identical list lines are treated as one entry.
Examples
Unique draw
Integers from 1 to 50, count 5, duplicates disabled
Five different values between 1 and 50
Team picker
One person per line, count 2
Two randomly selected names
Role-playing dice
3 dice with 20 sides
Three rolls and their total
Frequently asked questions
Are the endpoints included?
Yes. Both the minimum and maximum can be selected.
Can two identical values appear?
Yes when duplicates are enabled. Disable the option to sample without replacement.
Is this suitable for a regulated lottery?
No. Use an independently audited and legally compliant system for regulated draws.
Are my list entries saved?
No. They remain in the page and disappear when it is closed or reset.
Technical sources
- W3C - Web Cryptography Level 2
Normative definition of Crypto.getRandomValues and its random source.
- MDN - Crypto.getRandomValues()
Browser API documentation and compatibility notes.