Random Number Generator Online — Free Tool
Generate precise random integers or decimals within specified ranges, supporting unique constraints.
Random Number Generator
Generate random integers/decimals locally (optionally unique-only).
Privacy note: All processing happens entirely in your browser. No data is sent to our servers.
About this tool
Generate random integers or decimals within a min–max range for simulations, games, and testing. Unique mode avoids duplicates when drawing lottery-style numbers.
Cryptographic fairness is not guaranteed unless the tool uses crypto.getRandomValues for security-sensitive use.
Common use cases
- Board game dice substitutes
- Sampling random test cases in QA
- Generating PINs for dev environments only
- Teaching probability with classroom experiments
How to use
- Set minimum and maximum bounds.
- Choose how many numbers to generate.
- Enable unique mode if draws cannot repeat.
- Copy results or regenerate for new sets.
This page is available at /tools/random-number-generator/.
Understanding the result
- Inclusive vs exclusive bounds matter—check whether max value can appear.
- Decimal mode produces floating values; specify precision if offered.
- Unique mode fails if count exceeds range size.
- Pseudo-random sequences are not suitable for secrets without crypto RNG.
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FAQ
Inclusive range?
Most tools include both min and max. Verify before using for contests.
Unique random numbers?
Enable unique to simulate lottery balls without replacement.
Seed for reproducibility?
Dev tools may offer seeds; browser toys usually do not.
Cryptographically secure?
Use crypto RNG APIs for keys and tokens, not casual generators.