Random Number Generator
Set a range and quantity to generate random numbers in bulk and copy them all at once
Features
Generate up to 1,000 at once
Set a range and quantity to generate random numbers in bulk
No duplicates for lottery draws
Use no-duplicates mode to prevent the same number appearing twice for drawing winners or assigning turns
Switch between integers and decimals
Decimals can be aligned to 1–10 places and support negative ranges
Choose delimiter and copy all at once
Select from line break, comma, or space as delimiter and copy everything together
How to Use
Enter range and quantity
Input minimum value, maximum value, and desired quantity (1–1000)
Choose type and no-duplicates option
Select integer or decimal, and toggle no-duplicates on or off as needed
Adjust advanced settings
Change sort order and copy delimiter as needed
Generate and copy
Click 'Generate' to see results, then click 'Copy All' to get them
Use Cases
Decide campaign winners
Select winning numbers without duplicates from the range of entry numbers
Assign duties or presentation order
Randomly shuffle attendance numbers to assign roles or determine order
Sample data for statistics lessons or practice
Quickly generate numbers for calculating mean and variance
Dummy values for testing
Generate large quantities of numbers for testing spreadsheets or software
Knowledge Base
What is uniform random distribution?
Uniform random distribution means each value in the specified range has an equal probability of being selected. For integers from 1 to 100, each number has a 1/100 (1%) chance. When selecting 10 numbers from 1–100 with duplicates allowed, there's approximately a 37% chance of getting at least one duplicate—this is normal variation, not bias.
Maximum count for no-duplicates generation
The maximum number of unique integers you can generate is limited by the count of integers in the range (maximum value − minimum value + 1).
- For 1–100：The range 1–100 contains 100 integers, so you can generate a maximum of 100 unique numbers.
- For −5 to 5：The range −5 to 5 includes 0, giving 11 integers total. Generating 11 unique numbers produces each number exactly once.
Difference from Excel's RANDBETWEEN
Excel's RANDBETWEEN(minimum, maximum) is a function that returns a single integer within the range. It recalculates every time the sheet is edited, and the same number can appear in multiple cells. If you need a fixed list of unique numbers, paste the generated values to prevent recalculation from changing them.
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
Random number generation is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
Your input range and generated numbers and input suggestions are not stored on the server.
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Updates
- update #400
Random number generator added. Generate up to 1,000 unique numbers within a specified range
Featured Tools
RAKKOTOOLS is free to use!
Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
Use in streaming and videos
Use various tools such as lottery draws and raffles in live streams and videos.
Use in schools, work, and events
Can be used in various situations such as classes, team division, internal work, and events.
Introduction on Web, books, and SNS
Feel free to introduce it as a useful tool on web media, books, SNS, and other platforms.
Commercial use
Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
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If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
Credit example for the description
Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.