UUID Generator
This UUID generator produces RFC 4122-compliant identifiers in version 4 (fully random) or version 7 (time-ordered, monotonically increasing). Generate a single UUID or many at once — v7 is designed to sort naturally by creation time, which keeps database index pages sequential instead of fragmented. Every value is produced client-side using your browser’s cryptographically secure random source, with nothing sent to a server.
- 8cf42cb1-4dd8-44f3-a5e6-aaf5b89688c7
- 3473a263-6a02-45dd-82c6-05a53a3d34a3
- b1f17ecd-cca3-4005-809a-aa555d05aa49
- b9ae7c5d-0721-442a-a8d1-4737e477d6d2
- 75001ab6-dbb3-470f-b14f-88aced3fb9dc
- 3eba5477-c260-4022-8902-e4edb20c9fe9
- 0bdeea6f-d4b7-4933-8bb7-66cbcce13591
- a3e7ecc0-0acd-4043-a821-cfde485f98fd
- dbad546f-5492-4910-89f8-6816a7dbcd61
- fdf38aab-0844-4f6e-84ca-e68231be2a3b
Frequently asked questions
What is the difference between UUID v4 and UUID v7?
UUID v4 is built from 122 random bits and carries no inherent order, while UUID v7 embeds a 48-bit millisecond timestamp so newly generated values sort chronologically.
Which UUID version should I use for a database primary key?
Use v7 for primary keys, since its time-ordered structure appends new rows near the end of an index instead of scattering them, which keeps the index compact; use v4 when you just need a random, unlinkable identifier with no timing information.
Can I generate more than one UUID at a time?
Yes, you can generate a single UUID or a whole batch in one run, and every value — whether v4 or v7 — is generated independently.
Are the UUIDs generated here safe to use in production?
Yes — every UUID is generated locally in your browser using its built-in cryptographically secure random number generator, and nothing is sent to a server, so the values are suitable for real application and database use.
Does a UUID guarantee no collisions?
Not with mathematical certainty, but the probability is negligible — a v4 UUID has 122 random bits, so you would need to generate roughly 2.71 quintillion UUIDs before there is a 50% chance of one collision.
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