UUID Generator
Generate UUID v4 (random) or v7 (time-sorted). Bulk mode. Runs in your browser.
Click generate to produce UUIDs. All generation happens in your browser.
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Download FreeHow it works
UUID v4 comes straight from crypto.randomUUID(), which your browser implements on top of a cryptographically secure RNG. Every byte is random except the four version bits and two variant bits that identify the value as a v4 UUID. The probability of collision across billions of IDs is negligibly small.
UUID v7 follows RFC 9562: the first 48 bits are the current Unix timestamp in milliseconds, then 4 version bits, 12 bits of randomness, 2 variant bits, and a final 62 bits of randomness. Because the timestamp leads the value, v7 UUIDs sort chronologically in databases and indexes — a practical win over v4 for primary keys in write-heavy tables.
Everything runs client-side. Bulk mode up to 1,000 generates the whole set in a single pass and keeps them in memory; copy-all hands you a newline-separated block you can paste straight into a seed file. We do not log, store, or transmit any of the generated IDs.