Text & Dev · Free to use
UUID Generator
Generate cryptographically random v4 UUIDs — one or a batch — using the browser crypto API.
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How to use the uuid generator
- 1Choose how many UUIDs you need.
- 2Click generate.
- 3Copy one or copy all.
This tool runs in your browser. The text, files and values you enter are not uploaded to our server.
About the uuid generator
A UUID generator creates RFC-4122 version-4 universally unique identifiers — 128-bit random IDs used for database keys, idempotency keys, request tracing and distributed systems where coordination-free uniqueness matters. This tool uses the browser crypto API and can generate up to 100 at once.
Frequently asked questions
Is this tool free?
Yes — completely free, no signup, no watermark and no limits. Startup OG funds the site through its directory and partner program, not paywalled tools.
Are these UUIDs cryptographically random?
Yes — they use `crypto.randomUUID()`, which is backed by a cryptographically secure random source, generated locally in your browser.
What is a v4 UUID?
A UUID whose bits are random except the version/variant markers. Collisions are astronomically unlikely, which is why v4 is the default for most applications.
Can two v4 UUIDs ever collide?
Theoretically yes, practically no — you would need to generate billions per second for many years before a collision became likely.