randarium
your one-stop shop for random data
The one-stop shop for random data: UUID, password, coin flip, dice roll, random number, list picker, lorem ipsum, colors, datasets and more. Runs locally in your browser — no server, no account, nothing uploaded.
● crypto-secure RNG ◆ seeded & reproducible · no server · no account · nothing uploaded
- UUID Generate UUIDs of every version — v1, v3, v4, v5, v6, v7, v8, nil and max.
- Password Generate strong, random passwords with full control over character sets.
- Synthetic Data Studio Pro Design a synthetic dataset column by column — pick any field type, tune its options with real controls, and generate reproducible fake data in any locale.
- Random Number Generate random integers or floats in a range, with a seed.
- Coin Flipper Flip fair or weighted coins with reproducible results.
- Dice Roller Roll standard or custom-sided dice with a seed.
- List Shuffler Shuffle the order of any list with a seed.
- Random Picker Pick one or more random items from your list.
- Lorem Ipsum Generate seeded placeholder Lorem Ipsum text.
- Passphrase Generate memorable random passphrases from curated word lists.
- Nano ID Generate compact Nano ID-style strings for development.
- ULID Generate sortable ULID-style identifiers for development.
New tools NEW
- Chaos Scenario Generate realistic failure scenarios for chaos testing.
- Messy Data Generate intentionally dirty data for ETL and validation testing.
- Warehouse Schema Generate dimension, fact, date-dimension, or SCD2 warehouse schema rows.
- Event Stream Data Generate CDC, Kafka, telemetry, or clickstream event data.
- IoT Sensor Dataset Generate realistic IoT sensor readings for testing and monitoring systems.
- Fake Invoice Generate realistic invoice records for testing.
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Everything runs client-side. Generated values are never uploaded, saved to a URL, or logged. Passwords and secrets use your browser's cryptographic RNG.
About Randarium
Randarium is a free collection of 174 random data generators: flip a coin, roll dice, generate UUIDs and strong passwords, pick names from a list, and build fake datasets for testing — all in one place. Every tool runs entirely in your browser, so nothing you generate is ever uploaded, logged, or stored on a server.
- Is Randarium really free?
- Yes — every generator is free to use, with no account, sign-up, or install. The site is a static page; there is no server to pay for your data with.
- Are the results actually random?
- Two kinds, clearly labeled. Security tools (passwords, PINs, tokens) use your browser's cryptographic random number generator and can never be reproduced. Everything else is seeded randomness: statistically fair, and reproducible on purpose — reuse a seed to get the identical result, which makes draws verifiable and test data stable.
- Is my data private?
- Lists, settings, and generated output stay on your device. Nothing is uploaded, saved to a URL, or sent to analytics — the tools work the same with your network disconnected. See /privacy for the details.
- Can I use the generated data in my project?
- Yes — output is yours to use. Fake data is clearly synthetic (reserved test domains, non-functional numbers), so it is safe for fixtures, demos, and documentation.