UUID Generator
Generate random UUIDs (v4), one or many, in your browser.
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Frequently asked questions
A version-4 UUID is a 128-bit identifier whose bits are almost entirely random, with a fixed version digit (4) and variant bits. It is the most common UUID type for generating unique IDs without a central authority, because the chance of two random v4 UUIDs colliding is vanishingly small.
Yes. Each UUID is built from cryptographically secure random bytes via your browser's Web Crypto API (crypto.getRandomValues), then the version and variant bits are set per RFC 4122. That makes them suitable as database keys, request IDs, or file names where you need uniqueness.
Yes. Set the count to generate up to 100 at a time, one per line, and copy them all with one click. You can also toggle uppercase letters and turn the hyphens on or off to match the format your system expects.
No. Generation runs entirely in your browser using the Web Crypto API, so the UUIDs are created on your device and never uploaded. The page works offline once loaded, and nothing you generate or paste leaves this tab.
Last updated 2026-06-23.