Random Generators★ Free forever✓ No account🔒 No upload📴 Works offlineUpdated April 28, 2026

Free Random Number Generator Online — No Signup Required

Random Number Generator helps you Generate integers or decimals within a custom range — fair random number picker for games and decisions — free, in 2026, without leaving the browser. It is built for creators, developers, teachers, and teams that need sample data, so you can generate repeatable ideas, sample values, or quick decision helpers with a fast public URL, clear output, and a workflow that stays focused on the task instead of setup.

Browse all toolsBrowse more random generators toolsBuilt by Achraf A., Full-Stack Developer · Morocco

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What is Random Number Generator?

A random number generator (RNG) produces numbers that cannot be predicted from previous values — a fundamental requirement in cryptography, statistical sampling, gaming, simulations, and fair selection processes. True randomness in computing is achieved using hardware entropy sources (physical noise). Pseudo-random number generators (PRNGs) use deterministic algorithms seeded with entropy, producing sequences that are statistically random but not truly unpredictable. For most practical purposes — lottery picks, game mechanics, A/B test assignment, random sampling — a PRNG is sufficient. For cryptographic keys and security tokens, a cryptographically secure PRNG (CSPRNG) is required.

This generator supports integer ranges (minimum and maximum), decimal numbers with configurable precision, and cryptographic mode (uses the Web Crypto API's `crypto.getRandomValues()` for security-appropriate randomness). Generate a single number, a list of unique numbers (like lottery picks), or a sequence of numbers with repeats allowed. The distribution is uniform — each number in the range has an equal probability of being selected.

How to use Random Number Generator in 3 steps
  1. 1

    Set the range

    Enter the minimum and maximum values for your range. Negative values are supported.

  2. 2

    Choose options

    Set count (how many numbers), allow/disallow duplicates, and toggle cryptographic mode for security-sensitive use.

  3. 3

    Generate and copy

    Click Generate and copy the result for use in your lottery, sampling, or application.

Key features and benefits
  • Integer and decimal number generation
  • Cryptographic mode using Web Crypto API
  • Multiple numbers with or without duplicates
  • Free, instant, no account needed
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References and standards

Random Number Generator FAQs

Quick answers about the workflow, privacy, and where this tool fits in a broader job.

Is this truly random?

The cryptographic mode uses Web Crypto API (`crypto.getRandomValues()`), which draws from the OS entropy pool — suitable for security-sensitive use. Standard mode uses JavaScript's `Math.random()`, which is a PRNG — statistically uniform but not suitable for cryptographic purposes.

Can I generate lottery numbers?

Yes — set the range to your lottery's number range (e.g., 1–49 for UK Lottery), set count to the number of draws (6), and enable 'no duplicates.' The generated numbers are randomly ordered, not sorted — sort them yourself if the lottery requires sorted entry.

What is the difference between random and unique random?

Random with repeats allows the same number to appear multiple times in the output. Unique random (no duplicates) guarantees each number appears at most once — equivalent to drawing from a deck of cards without replacement.

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Built and maintained by

Achraf A.

Founder & developer — built and maintains every tool on this site

Last updated:

Tested in Chrome, Firefox, and Safari on desktop and mobile.

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