UUID Generator
Generate UUIDs v1, v4 in bulk
UUID Generator creates version 4 (random) UUIDs using the browser's or server's cryptographic random number generator — the standard way to generate unique identifiers with no coordination needed between systems.
How to use UUID Generator
- 1
Choose how many UUIDs you need (up to 1000 at once).
- 2
Click "Generate" to create them instantly.
- 3
Copy a single UUID, or copy the whole list at once.
- 4
Generate again any time for a fresh, unrelated set.
Everything you need to know about UUIDs
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value, conventionally written as a string like `550e8400-e29b-41d4-a716-446655440000`, designed so that generating one independently on different machines produces an effectively-guaranteed-unique value — no central coordination or database lookup required.
v1 vs. v4 — which should you use?
| Version | How it's generated |
|---|---|
| v1 | Based on timestamp and (historically) network address — can leak generation time/machine |
| v4 | Fully random — the standard default choice for most applications today |
When you actually need this
Database primary keys, session identifiers, and idempotency keys are the most common uses — anywhere you need a unique ID without a database round-trip to check for collisions.
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Frequently Asked Questions
What's a v4 UUID, and why that version?
Version 4 UUIDs are generated from random bits rather than from a timestamp or hardware address (as v1 does), which avoids leaking when or where they were created and is the version almost every modern system expects by default.
How likely is a collision?
Astronomically unlikely — a v4 UUID has 122 random bits, so you'd need to generate billions of UUIDs per second for centuries before a coincidental duplicate became plausible.
Is the randomness actually secure?
Yes — generation uses the platform's cryptographic random number generator (crypto.randomUUID()), not a predictable pseudo-random source.
Does this tool send anything to a server?
Yes — the generation request is sent to our servers and the UUIDs are returned to you; nothing is stored.
Is there a limit on how many I can generate?
Up to 1000 UUIDs per request — generate again as many times as you need.