Developer Tools
Random Number Generator
Generate random integers or decimal numbers for samples, tests, classroom examples, spreadsheets, and browser-local copy-paste workflows.
Output is capped at 10,000 numbers to keep the browser responsive. Unique mode is limited to whole numbers.
Copy the numbers or pass them into list and CSV tools.
Random number workflow tips
Create test data and examples
Use whole numbers for IDs, sample scores, fixture rows, and quick spreadsheet demos. Use decimal places when you need mock measurements or prices.
Use unique numbers carefully
Unique mode works with whole numbers only and requires a range large enough for the requested count. Turn it on for raffle-style picks or non-repeating sample IDs.
Chain with list tools
After generating a random batch, use Number List Generator for ordered sequences, List to CSV for spreadsheet handoffs, or Remove Duplicate Lines for cleanup.
What this tool does
The Random Number Generator creates one or more random numbers within a chosen range, with optional unique whole-number output, sorting, decimal places, and copy-friendly separators.
Common use cases
Generate random integers or decimal numbers for test data, examples, sample spreadsheets, classroom prompts, and browser-local list workflows.
Use Random Number Generator when you are working with copied API payloads, logs, encoded values, config snippets, identifiers, or debugging data and need a quick browser-local check before pasting the result into docs, tickets, tests, or another developer tool.
How to use it
- Choose how many random numbers to generate, then set the minimum and maximum range.
- Pick whole numbers or decimal places, optionally require unique whole numbers, and choose a separator.
- Generate a fresh batch, sort if needed, and copy the output into your spreadsheet, test fixture, or list workflow.
Example workflow
Copy a small payload or encoded value from an API response, request URL, log line, or config file. Run the focused check here, confirm the output is readable, then continue with related developer data tools such as validation, formatting, decoding, timestamp conversion, or CSV/JSON conversion.
Privacy note
Client-side only: random numbers are generated in your browser and are not uploaded, stored, fetched, or logged.
FAQ
Can I generate unique random numbers?
Yes. Turn on unique whole numbers and choose a range large enough for the count you need.
Can I generate decimal random numbers?
Yes. Set decimal places from 1 to 6. Unique mode is available only for whole numbers.
Does this random number generator upload my output?
No. Random numbers are generated locally in your browser and are not uploaded, stored, fetched, or logged by ClearUtils.
Explore more tools
Browse the Developer Tools hub or continue with the Developer Data Toolkit when this task is part of a larger workflow.