Random Number Generator 1-1000
Generate a random integer from 1 to 1000, with both ends included.
This page returns integers from 1 to 1000 — each number has a 0.1% chance. The range is fixed so you can generate again without re-entering the bounds.
Typical use: lottery-style draws, sampling from a large list, or testing pagination and offsets. If you need a different range, the fields above are editable; the URL stays on this page and nothing is submitted anywhere.
How to use it
- Press generate — the range is already set to 1-1000.
- Turn on no-repeats if you are drawing several winners from the same set.
- Copy the result, or keep generating; each result is independent.
Why the range stops at 1000
A thousand is the smallest range that feels genuinely sparse — you can generate twenty values and expect no repeats. With 1000 possible values, the chance of any specific number coming up is each number has a 0.1% chance.
Generating with a narrow range is not the same as generating a wide range and rejecting out-of-range values. Filtering like that biases the result towards whatever is left; this tool draws directly from the range you set, using rejection sampling on the raw random bits.
Reviewed 2026-10-21. This tool runs entirely in your browser — no server, no account, and nothing you generate is stored.
Frequently asked questions
How many values before I see a repeat in 1-1000?
By the birthday problem, a repeat becomes likely around 37 draws. If repeats are unacceptable, turn on no-repeats — the tool then samples without replacement.
Is 1 or 1000 more likely than the middle values?
No. Each of the 1000 values has an identical probability. If you generate a few hundred results, the counts should converge towards equal — small samples always look lumpy.
Can I generate more than one number at once?
Yes. Set the count above; leave no-repeats off if duplicates are acceptable, turn it on if you are drawing distinct winners.
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