UUID Generator
Generate random UUIDs.
Runs entirely in your browser — nothing you enter is uploaded or sent to a server.
Version-4 UUIDs are random, so a clash is astronomically unlikely but never truly impossible — perfect as identifiers, but a UUID isn't a secret, so don't use one as a security token. Read our full disclaimer.
About this tool
A UUID (Universally Unique Identifier) is a 128-bit value written as 36 characters, used as a practically collision-free ID for database rows, correlation IDs, and test fixtures. This tool generates version-4 (random) UUIDs using the Web Crypto API, so they're cryptographically strong. Generate as many as you need and copy them individually or all at once.
What you get
Each value looks like 3f2504e0-4f89-41d3-9a0c-0305e82c3301 — 8-4-4-4-12 hex digits, with the version 4 marker and variant bits set per RFC 4122.
How to use
- 1Choose how many UUIDs you want (1–50).
- 2Press Generate to create a fresh set.
- 3Copy a single UUID, or use Copy all to grab the whole list.
Features
- Version-4 (random) UUIDs from the cryptographically secure Web Crypto API.
- Generate anywhere from 1 to 50 in a batch.
- Copy a single UUID, or the whole list at once.
Frequently asked questions
Are these UUIDs safe to use as database keys?
Yes. Version-4 UUIDs are generated from cryptographically strong random numbers, so the chance of a collision is negligible for typical use.
What is a version-4 UUID?
Version 4 is the fully random UUID — 122 of its 128 bits come from a random source, with a few bits fixed to mark the version and variant. It's the most common kind for IDs because it needs no central coordinator.
Are UUIDs guaranteed to be unique?
Not formally, but effectively so: with 122 random bits the odds of two v4 UUIDs colliding are astronomically small for any realistic number of IDs. Treat them as unique in practice, not as a cryptographic guarantee.
Can I use a UUID as a password or token?
No. A UUID is an identifier, not a secret — unpredictable enough to be hard to guess, but not meant to protect anything. For a password use our Password Generator; for a random secret, a longer random string.
What version of UUID does this generate?
Version 4 (fully random), the most common general-purpose type, formatted per RFC 4122.
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