Number Generators
Number Randomizer
Paste your own numbers and shuffle them into a random order, or pick a random few from the list. Handles thousands of lines instantly.
Number Randomizer
10 numbers shuffled
Numbers to randomize
Paste your own numbers, or fill a sequence on the right
Options
Copy separatorHow to use the number randomizer
- Paste your numbers into the box, separated by spaces, commas or new lines, or fill a sequence 1 to N.
- Tick Remove duplicates first if the list may contain the same number twice.
- Press Randomize order for a fresh shuffle, then copy or download the result.
How many orders a list can take
A shuffle picks one arrangement out of every possible ordering, and that count is the factorial of the list length. It grows faster than almost anything else in mathematics.
| List length | Possible orders |
|---|---|
| 3 | 6 |
| 5 | 120 |
| 10 | 3,628,800 |
| 13 | 6,227,020,800 |
| 20 | about 2.4 quintillion |
| 52 | a 68 digit number, about 8.07 times 10 to the 67 |
The last row is the famous deck of cards result: 52 items can be ordered in so many ways that a well shuffled deck has almost certainly never repeated an order in all of history. Shuffle a list of 52 numbers here and the same is true of your result.
Why the shuffle method matters
This tool uses the Fisher Yates shuffle, which walks the list once and swaps each position with a randomly chosen earlier one. Done this way, every possible order has exactly the same probability. The well known shortcut of sorting a list by a random comparison looks similar but is provably biased, some orders come up measurably more often, which is why careful tools avoid it. The randomness behind each swap comes from the browser cryptographic source.
How this compares with other list randomizers
RANDOM.ORG offers a well known list randomizer that shuffles up to 10,000 items using atmospheric noise on its servers, which means each shuffle is a network request. This page shuffles entirely on your device, so it works offline, has no item quota beyond the 1000 number sequence fill, and your list never leaves the browser, which matters when the numbers are seat allocations, account references or anything else you would rather not upload.
Popular generators
Frequently asked questions
What does the number randomizer do
It takes a list of numbers and shuffles them into a new random order. The same numbers come back, just rearranged.
How do I enter my numbers
Type or paste them into the box separated by spaces, commas or new lines. You can also fill a sequence 1 to N with one click.
Does it change the numbers themselves
No. A shuffle only changes the order. Every number you entered is still there once, unless you remove duplicates.
Is the shuffle fair
Yes. It uses a Fisher Yates shuffle driven by the browser cryptographic random source, so every ordering is equally likely.
Is it free
Yes, free and with no sign up. Everything runs in your browser and nothing you enter leaves your device.
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Want a draw rather than a reorder? The random number generator picks fresh numbers, and the no repeats generator draws a unique set from a range.