UUID v4 Generator
Generate RFC 4122 version 4 UUIDs in bulk, from a single one to dozens, with one click.
About UUID v4 Generator
Software relies on unique identifiers everywhere — database rows, API requests, cache keys, and message queues — and inventing them by hand or with a counter invites collisions and coordination headaches. A UUID v4 is a 128-bit identifier generated from random data, formatted into the familiar 8-4-4-4-12 pattern, and this tool produces them instantly in any quantity.
Each identifier is built using the browser's secure random source, with the version and variant bits set to comply with RFC 4122. You choose the count and whether to wrap each UUID in quotes for direct pasting into code arrays or SQL inserts. Since generation happens locally, nothing you create is ever transmitted anywhere.
Developers reach for it when writing migrations that need stable primary keys, when building distributed systems that can't coordinate ID assignment, and when generating tracking or correlation IDs for logs. Testers and API consumers use batches to build realistic fixture data quickly.
How to Use
- Choose how many UUIDs you need.
- Press Generate UUIDs.
- Copy the batch, with or without surrounding quotes.
Example
Generate 3 550e8400-e29b-41d4-a716-446655440000 ... (3 total)
Version 4 UUIDs are 36-character identifiers built from random data, with the version and variant bits set to spec.
FAQ
What is a UUID v4?
A 128-bit identifier with 122 bits of randomness, formatted as 8-4-4-4-12 hex digits. Collisions are astronomically unlikely.
When do I need a UUID?
Database primary keys, tracking IDs, cache keys, and anywhere you need a unique identifier without coordination.
Can I generate them with quotes for arrays?
Yes, an option wraps each UUID in quotes so the batch can be pasted directly into a code array.
Can a UUID v4 ever collide?
Theoretically yes, but practically no. With 122 random bits there are roughly 5.3 × 10^36 possible values, so collisions are so unlikely that UUIDs are treated as unique in practice.
Are UUIDs suitable as database primary keys?
Yes, they're a common choice because IDs can be generated anywhere without a round trip to the database. Indexing them is slightly heavier than integers, which is why very large tables sometimes prefer ULIDs or numeric sequences.