Free Random Generators
Instant tools for numbers, passwords, dice, coins, UUIDs and usernames. Powered by the Web Crypto API — everything runs in your browser.
Random Numbers
Cryptographically secure random integers
Passwords
Strong passwords in multiple formats
Dice Rollers
Fair digital dice for games and RPGs
Other Tools
Coins, UUIDs, and usernames
How it works
- 1Your browser generates cryptographic random bytes
- 2Values are mapped to the range you need
- 3Results display instantly — nothing leaves your device
Privacy by design
- No server calls — everything runs locally
- No cookies or tracking scripts
- No data storage or logging
- Source code inspectable in your browser
What is cryptographic randomness?
Most programming languages offer a basic Math.random() function, but it uses a predictable pseudorandom algorithm — if you know the seed, you can reproduce the entire sequence. That's fine for shuffling a playlist, but not for generating passwords or making fair decisions.
The Web Crypto API solves this by drawing entropy from your operating system — hardware noise, interrupt timing, and other unpredictable physical sources. Every generator on Rangdom uses this API, producing values that are statistically uniform and impossible to predict.
When do you need a random generator?
- Creating strong, unique passwords for accounts and services
- Picking a random number for games, raffles, or decisions
- Rolling dice for tabletop RPGs when no physical dice are available
- Generating UUIDs for database records or API identifiers
- Flipping a coin to settle a debate or make a binary choice
- Creating random usernames for new accounts or testing