Create Random List

Math.random() is fast but uses a deterministic pseudo-random generator. Its internal state can be predicted given enough output samples – fine for shuffling cards in a game, NOT fine for password generation, secret tokens, lottery draws, or anything where an attacker predicting the output would be a problem. crypto.getRandomValues draws from the OS entropy pool (Linux /dev/urandom, Windows CNG, etc.) and is suitable for cryptographic use. Toggle the checkbox. UUIDs always use the crypto RNG regardless.

Yes. The original used Math.floor(Math.random() * (max - min) + min) for integer generation, which produces values in [min, max) – never returning max. Setting min=1, max=100 actually produced 1-99. The fix is +1: Math.floor(rng() * (max - min + 1)) + min. Now max is reachable.

The tool returns the maximum unique items possible plus an info toast: “Requested 1000 unique, got 220 (pool exhausted)”. The original silently broke out of the loop after 100 failed attempts, returning fewer items than requested with no indication. Now you get both the truth and the toast.

220 words. The original had 48. Syllable-based mode synthesizes from 90 syllables in 2-4-syllable combinations, giving effectively infinite distinct outputs.

Letters: 26 (single case) or 52 (mixed). Words common: 220. Words syllable: effectively infinite (~90⁴ = 65 million 4-syllable combinations). Numbers integer: max - min + 1. Numbers decimal: effectively infinite. UUIDs: effectively infinite (2¹²² ≈ 5×10³⁶).

Standard crypto.randomUUID() when available (Chrome 92+, Firefox 95+, Safari 15.4+). Fallback uses crypto.getRandomValues() with proper version-4 / variant bit setting. Last-resort fallback for ancient browsers uses Math.random – but this hasn’t been needed since 2022.

One value per row. Values containing commas, double-quotes, or newlines are wrapped in "..." with internal quotes doubled (RFC 4180). For numbers/letters this rarely matters; for words it’s safe but unnecessary. Useful when piping into Excel / Google Sheets.

100,000 items per generation. The original was 10,000; bumped because main-thread generation is fast enough for the new cap (even at 100k UUIDs you see ~1 second). For larger needs, run in a Node script.

Because they’re filler. The tool does what it says; you know your use case better than we do. The original FAQ said things like “Perfect for testing data, words for placeholder text, letters for password generation”. That last one is dangerous advice – letters generated via Math.random() are NOT safe for passwords. Use the Crypto RNG checkbox if you actually need a password.

No. The random generation runs entirely in your browser – nothing is sent to a server, logged, or stored, and the tool keeps working offline once the page has loaded.