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UUID Generator (v4)

Generate one or many random UUIDs (RFC 4122 v4) instantly for databases, APIs and test data.

100% free No sign-up Private · runs in your browser

How to use the free online uuid generator

Set how many UUIDs you need (1–100).
Optionally tick 'Uppercase' or 'Braces' formatting.
Click Generate, then copy the list.

About this tool

Generate RFC 4122 version 4 UUIDs instantly — one, or up to 100 at a time — for database keys, API requests, order IDs, test data and event tracking. UUIDs are 128-bit random identifiers with an astronomically low collision chance, produced here with the browser's secure crypto.getRandomValues(). Toggle uppercase and brace formatting, then copy the whole list with one click. Free, unlimited, no sign-up.

Key features

RFC 4122 v4
Bulk: up to 100 at once
Uppercase & braces options
One-click copy

Privacy first: every calculation and generation runs 100% locally in your web browser using the Web Crypto API. Your input never touches a server — nothing is stored, logged or sold.

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Frequently asked questions

A UUID (Universally Unique IDentifier) is a 128-bit value formatted as 36 characters, e.g. 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are generated from random data, making collisions astronomically unlikely.

Yes. We use the browser's crypto.getRandomValues() to generate them, the same secure source that powers tokens and encryption keys.

Absolutely — use the 'How many' field to generate up to 100 UUIDs in a single click, ideal for seeding databases.

Database primary keys, API identifiers, order IDs, tracking events, and anywhere you need a unique key without a central counter.