Numbers
Random Number Generator
A random number generator should be instant and bias-free, and this one is. Set a minimum, a maximum, and how many you need — up to 100 in a single pass — and the results appear immediately. No formulas, no spreadsheets, no reloading. Developers use it to seed test data and mock IDs; teachers use it for classroom sampling; game masters roll custom dice across any range. Beyond the basics, switch on Unique to draw with no repeats (perfect for lottery lines or raffle picks), sort the results ascending or descending, and output them as a newline list, a comma- or space-separated row, or a JSON array you can paste straight into code. The min and max fields accept negatives and large integers, so one number between 1 and 6 or fifty between -500 and 500 use the very same controls.
Read the complete guide — 4 min read
Added April 2026
How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Set the Minimum field to the lowest number your result should be able to reach.
- Set the Maximum field to the highest number your result should be able to reach.
- Set the Count field to how many separate random numbers you want generated at once.
- Click Generate to produce your results instantly in the output area.
- Copy the output with the copy button and use it directly in your spreadsheet, draw, or application.
Use Cases
- •Seeding mock user IDs into a Postgres staging database for integration tests
- •Rolling custom dice (1–20 for D&D, 1–100 for percentile) without a physical die
- •Selecting random student groups in a classroom by assigning numbered seats
- •Picking raffle winners from a numbered ticket pool without bias
- •Generating random coordinate offsets between -500 and 500 for a game map prototype
Tips
- →For unique raffle draws, generate one number at a time and remove that entrant before drawing again to avoid repeat winners.
- →When generating test data, use a count of 50–100 and paste directly into a CSV column to seed a database quickly.
- →Negative-to-positive ranges (e.g., -50 to 50) are ideal for generating coordinate offsets or simulating sensor noise in demos.
- →For classroom probability experiments, run the same range 30+ times and tally results to visually demonstrate the law of large numbers.
- →If you need non-repeating numbers in a small range (like 1–10 shuffled), generate all 10 at once and re-roll any duplicates rather than generating one by one.
- →Use a range of 1–365 to assign random days of the year for scheduling tasks, event simulations, or birthday probability puzzles.
FAQ
How do I generate multiple random numbers at once?
Set the Count field to any whole number up to 100 and all results appear after a single click. By default numbers are drawn independently, so duplicates are possible — just like drawing with replacement. Switch on the Unique toggle if you need every value in the batch to be distinct.
Are the numbers truly random or pseudo-random?
The generator uses JavaScript's Math.random(), which is pseudo-random — algorithm-driven, not hardware-sourced entropy. For raffles, games, classroom picks, and test data it's more than random enough. For cryptographic keys or security tokens, use a tool built on a CSPRNG instead.
Can I generate negative random numbers with this tool?
Yes. Enter a negative value in the Minimum field (e.g., -100) and set Maximum to your upper bound. This is handy for simulating temperatures, coordinate offsets, elevation changes, or any range that crosses zero. Both fields accept values down to -1,000,000.
How do I generate a random number between two values?
Set the minimum to the lower bound and the maximum to the upper bound, leave the count at 1, and click Generate — you get a single random integer in that inclusive range. Both endpoints can appear, so a 1–6 range behaves exactly like a six-sided die.
Can I generate random numbers with no duplicates?
Yes — turn on the Unique toggle and the tool draws without replacement, so every number in the batch is distinct (six unique numbers from 1–49 for a lottery line, for example). If you request more numbers than the range can supply, you get every value in the range once rather than padded repeats. Leave Unique off for independent draws where repeats are allowed.
Can I get the numbers comma-separated or as a JSON array?
Yes — use the Output Format control to switch between a newline list (one per line), comma- or space-separated on a single line, or a JSON array like [4, 18, 7] that drops straight into JavaScript, Python, or a config file. Combine it with Ascending or Descending order for a sorted, ready-to-paste sequence.
You might also like
Popular tools from other categories that share themes with this one.
Try these next
More free tools from other corners of the catalog, picked by shared themes.