Generate truly random numbers using cryptographic randomness. Roll dice, flip a coin, pick a random winner from a list, generate lottery numbers, or produce multiple unique random numbers at once. 100% free, instant, no login.
⚡ Uses window.crypto — true cryptographic randomness. Zero data stored.
The Random Number Generator by WorldOfTools is a high-precision, cryptographically secure utility designed to provide true randomness for developers, researchers, and everyday users. Unlike standard calculators that use predictable math formulas (pseudo-randomness), our tool leverages the window.crypto.getRandomValues() API, which is the same technology used in bank-level security and secure session management.
Whether you are picking a winner for a lucky draw, generating secure testing data for a web app, playing tabletop RPGs, or simply making a fair decision between friends, our tool ensures that every result is mathematically unbiased and impossible to predict.
Set the Range: Enter your minimum and maximum values (e.g., 1 to 100). The tool supports negative numbers and large integers.
Choose Quantity: Decide if you need a single number or a list of multiple random numbers generated at once.
Allow Duplicates? Toggle whether the same number can appear more than once in your results (useful for draws where a participant can only win once).
A Pseudo-Random Number Generator (PRNG) uses a formula to generate a sequence that looks random but will eventually repeat. A True Random Number Generator (TRNG) or Cryptographically Secure PRNG (CSPRNG)—like the one we use—utilizes physical entropy (system noise, timing) to ensure the numbers cannot be predicted even if the algorithm is known.
While the randomness is secure, we recommend using our dedicated Password Generator for creating logins, as it includes character complexity settings (symbols, caps) specifically designed for security.
Yes! Our tool includes a mode to pick a random item from a list. Just paste your names or items, and it will shuffle and pick one fairly.
Single Number — Set a min and max range, click Generate for one cryptographically random number. Perfect for decisions, games, and giveaways.
Multiple Numbers — Generate 1–50 numbers at once, with optional uniqueness. Great for lottery pools, test data, and fair draws.
Dice Roller — Choose from D4–D100 tabletop dice. Roll multiple dice at once for RPGs, board games, or any dice-based decision.
List Picker — Paste names or options, pick N random winners. Perfect for classroom picks, prize draws, and decision-making.
Yes. We use window.crypto.getRandomValues() — the same cryptographic API browsers use for security operations. Far more random than Math.random().
Select the 'Single Number' tab, set Min to 1 and Max to 100, then click Generate. Every number in that range has exactly equal probability.
Yes! Use the 'Dice Roller' tab. Select D4, D6, D8, D10, D12, D20, or D100. Choose how many dice to roll simultaneously. Perfect for tabletop RPG sessions.
Use the 'List Picker' tab. Enter names one per line and click Pick Random. You can pick multiple unique winners at once — no repeats if you enable unique mode.
Yes. Use the 'Lottery' tab — set your range (e.g., 1–49), choose how many numbers to pick (e.g., 6), and click Generate. You'll get 6 unique, non-repeating numbers.
Exactly 50/50. Each flip uses crypto.getRandomValues() to generate a truly unbiased random bit. No pattern, no prediction — perfect fairness.