Is this cryptographically secure?

Assume general-purpose unless the page explicitly documents CSPRNG usage.

Enable “unique picks” if the tool offers it when drawing lottery-style numbers.

Extreme ranges can show floating point artifacts; round sensibly.

Random Number Generator

Generate random numbers with custom range and options

Minimum Value

Maximum Value

How Many Numbers?

Number Type

Allow Duplicate Numbers

Generated Numbers

0 numbers

One per line Comma separated Space separated

How it works: This tool generates truly random numbers using JavaScript's Math.random() function. You can customize the range, number of values, and whether to allow duplicates. Perfect for testing, lotteries, random selections, and data generation.

Random numbers: fairness, testing, and sampling

Random values power games, statistical sampling, fuzz testing, and classroom demos. A good generator exposes seed behavior (if any), decimal precision, and inclusive/exclusive bounds so results match your definition of “random”.

Cryptographic secrets require crypto-grade RNGs in your platform libraries—not every browser Math.random use case qualifies.

Practical tips

Document whether bounds are inclusive for reproducible science projects.
Export batches to CSV with List to CSV helpers when needed.
Reseed classroom demos if students memorize sequences.
Use UUID generator when uniqueness matters more than uniform distribution.

Common questions

Is this cryptographically secure?: Assume general-purpose unless the page explicitly documents CSPRNG usage.
Duplicates in a set?: Enable “unique picks” if the tool offers it when drawing lottery-style numbers.
Floating point bias?: Extreme ranges can show floating point artifacts; round sensibly.

Related tools on Toolfex

Toolfex provides free online utilities for individuals and teams. Use these guides alongside each tool’s on-page controls. For privacy and data handling, see our Privacy Policy.