UUID Generator
Generate UUID v4, v1, and v7 in bulk online. Cryptographically secure via the Web Crypto API (crypto.getRandomValues). Uppercase, hyphenated, copy-all, copy-first. 100% browser-based, no signup, unlimited.
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3 UUID Versions
Generate RFC 4122 v4 (random), v1 (time-based with Gregorian timestamp + random node), or RFC 9562 v7 (Unix-ms timestamp + random). All bits drawn from the Web Crypto API.
100% Private
Every UUID is generated entirely in your browser with `crypto.getRandomValues`. Nothing is uploaded, logged, or sent to any server. No signup, no tracking.
Bulk Generation
Generate 1, 5, 10, 50, or 100 UUIDs in one click. Copy-all copies the full list joined by newlines; copy-first grabs just the top UUID. Instant regeneration on any option change.
Format Control
Toggle uppercase hex, toggle hyphens on/off (32 contiguous hex chars when off). One-click copy with clipboard fallback for non-secure contexts. Fully responsive on any device.
Is this UUID generator safe to use?
Yes. All randomness comes from `crypto.getRandomValues`, the same cryptographic primitive browsers use for TLS. UUIDs are generated entirely in your browser — no network request is ever made.
What is the difference between UUID v4, v1, and v7?
v4 is fully random (RFC 4122). v1 is time-based: a 60-bit timestamp in 100-ns intervals since the Gregorian epoch (1582-10-15 UTC) plus a 14-bit clock sequence and a 48-bit random node. v7 (RFC 9562) puts a 48-bit Unix-millisecond timestamp first, then 74 random bits — so v7 UUIDs sort chronologically, which is ideal for database indexes.
How many UUIDs can I generate at once?
Pick 1, 5, 10, 50, or 100 from the count grid. The output is one UUID per line in a scrollable area; click "Copy All" to copy the whole list joined by newlines, or "Copy First" for just the top one.
Are the generated UUIDs collision-free?
For v4, the random space is 2^122 — collision probability is effectively zero until you have generated billions. For v1, the random 48-bit node plus 14-bit clock sequence makes collisions extremely unlikely even across machines. For v7, the 74 random bits plus the millisecond timestamp make collisions essentially impossible in practice.
What does the "Hyphenated" toggle do?
When ON (default), UUIDs are formatted as 8-4-4-4-12 with hyphens (e.g. `550e8400-e29b-41d4-a716-446655440000`). When OFF, the 32 hex characters are concatenated without hyphens — useful for compact storage or as URL/path-safe identifiers.
Ready to use the UUID Generator?
Free, no signup, no watermark. 100% browser-based. Your data never leaves your device.
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