UUID Batch Generator

What this generator does

Produces many version 4 UUIDs at once, for seeding a table or filling a fixture file where generating them one at a time would be tedious. Each is drawn independently from the browser's cryptographic random number generator, exactly as the single UUID generator does.

How to use this tool

1. Press generate for a batch of UUIDs.

Worked examples

Format

3f2504e0-4f89-41d3-9a0c-0305e82c3301

Version

Version 4 — 122 random bits, with version and variant bits fixed per RFC 4122

Common use cases

• Populating test data with multiple IDs
• Bulk placeholder database keys
• Quick batch of unique identifiers

How this generator works

Five version-4 UUIDs are drawn independently, one after another, each using the browser's cryptographic random number generator for all 122 free bits, with the version and variant bits fixed per RFC 4122 exactly as the single-UUID generator sets them. Drawing five independently rather than deriving them from one seed is what keeps each one exactly as unguessable as a UUID generated alone.

Limitations and good to know

• Always exactly five per press. For a different quantity, the single UUID generator can be pressed as many times as needed.
• Being independent draws, a collision within the batch is not impossible — merely astronomically unlikely, the same guarantee a single UUID carries.
• Nothing about a UUID's format signals when or how it was created — there is no ordering to rely on across the five.

Common mistakes

Using a generated UUID as a security token

A UUID is an identifier, not a secret — it is often logged, put in URLs and shared. Use the API key or secure token generator for anything that grants access.

Practical tips

• Generate the batch once and paste it into a fixture rather than regenerating per test run, so a failing test is reproducible.
• Version 4 UUIDs carry no timestamp or ordering, so do not rely on them to sort records by creation.