UUID generator, v4, in bulk
crypto.randomUUID from your own browser — CSPRNG-backed, RFC 4122, one to a hundred at a time.
The most boring tool here, deliberately
A UUID generator has exactly one job: produce identifiers random enough to never collide. Your browser ships a vetted implementation — crypto.randomUUID(), backed by the operating system's entropy source — so this tool adds nothing on top: no seeding, no homegrown randomness, no server that sees identifiers destined to become your database keys. Pick a count, pick a case, copy.
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Frequently asked questions
How do I generate a UUID?
One is already waiting when the page loads. Pick how many you need (1 to 100) and the casing, hit Generate, copy. Each is a version 4 UUID from your browser’s cryptographically secure random source.
What is a version 4 UUID?
A 128-bit identifier with 122 random bits, formatted as 36 characters (8-4-4-4-12). The collision odds are so small — you would need to generate billions per second for decades to expect one — that v4 UUIDs are safely treated as globally unique.
Is this generator cryptographically secure?
It calls crypto.randomUUID(), the browser’s own implementation backed by the OS entropy source — the same quality of randomness your browser uses for TLS. No Math.random() anywhere.
Uppercase or lowercase?
RFC 4122 specifies lowercase for output, and most ecosystems follow it — use lowercase unless a legacy system (some Microsoft tooling, for example) expects uppercase. Comparisons should be case-insensitive either way.
Are the generated UUIDs logged anywhere?
No — they are generated in your tab and exist only there until you copy them. Since UUIDs often become database keys and API identifiers, not leaking them at birth is a reasonable default.