Random Numbers Without Repeats Generator
Generates a set of unique random numbers with no duplicates in a given range
- 92
- 14
- 56
- 20
- 50
- 80
- 11
- 2
- 81
- 32
Generated 10 items
About this generator
A random number generator without repetition draws each value from a shuffled pool of every integer in your range, so every number in the batch is distinct — perfect for lottery lines, raffle picks, bingo cards, or any sampling where duplicates would break the point. Set a minimum, a maximum, and how many numbers you need. Sort the results ascending, descending, or leave them in draw order. If you ask for more numbers than the range can supply — say 100 unique numbers from 1 to 10 — the tool tells you plainly and returns as many as the range actually holds. No silent short answers. The count cap for a single run is 1000; the min and max fields accept negatives and large integers, so a symmetric range like -500 to 500 works exactly the same as 1 to 100. Every draw uses a Fisher–Yates shuffle so each valid combination has an equal chance of coming up.
How to use
- Set the Min and Max fields to the lower and upper bounds of your range.
- Enter how many numbers you want in the How Many field (1-1000).
- Optional: choose Ascending or Descending order, or leave it Unsorted for draw order.
- Click Generate to get a list of distinct numbers, one per line, ready to copy.
- If your count exceeds the range size, the output starts with a "— capped to N —" note so you know why.
Use Cases
- •Simulating a 6/49 lottery draw by setting min to 1, max to 49, and count to 6
- •Randomly assigning unique seat numbers to 30 students before a classroom exam
- •Generating non-repeating question IDs to shuffle a 20-question Typeform quiz
- •Picking 50 unique respondents from a 500-person survey pool for qualitative follow-up
- •Seeding unique enemy spawn IDs into a game-level config file during development
Tips
- →For a raffle draw, set the count to the number of prizes and the range to the number of tickets sold.
- →For a lottery line, use the exact rules of the lottery — for example count 6 from 1 to 49 for a UK Lotto pick.
- →Sort ascending when the numbers will be read aloud or logged; leave unsorted when draw order matters (like turn order in a game).
- →To sample without replacement across a batch you already have in hand, use one of the list picker generators instead — this tool draws from a numeric range only.
- →If you need more than 1000 distinct numbers, split the request into runs on non-overlapping sub-ranges.
FAQ
How do I generate random numbers with no repeats?
Set the min, max, and count fields to your range and how many distinct numbers you need, then click Generate. The tool draws from a shuffled pool of every integer in the range, so no value appears twice in a single run.
What happens if I ask for more numbers than the range can hold?
The tool returns as many as the range actually contains and prepends a note that starts with "— capped to N —" so you can see it happened. It never pads the result with duplicates and never silently returns fewer numbers with no explanation.
How many numbers can I generate at once?
Up to 1,000 unique numbers per run. If you type a larger count it caps to 1,000 and shows a note in the output. For a bigger sample, run the tool a few times with different seeds.
Are the numbers truly random?
The generator uses JavaScript's Math.random(), which is a pseudo-random source seeded from your browser. It is statistically unbiased for lotteries, raffles, classroom demos, and any non-cryptographic use. For security keys or gambling money, use a CSPRNG or a dedicated RNG service.
Can I use negative numbers or ranges that cross zero?
Yes. The min and max fields accept any integer from -1,000,000 to 1,000,000. Ranges like -50 to 50 work exactly the same as 1 to 100. If you type min and max in the wrong order, the tool swaps them for you.
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