UUID Generator

Generate version 4 UUIDs individually or in bulk for IDs and testing.

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How to use UUID Generator

Three quick steps — no sign-up needed

  1. Step 1

    Set how many UUIDs

    Choose a single ID or a batch for test data.

  2. Step 2

    Generate UUID v4 values

    Create random version-4 UUIDs suitable for many application IDs.

  3. Step 3

    Copy into your project

    Paste into fixtures, database seeds, or API tests.

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About UUID Generator

UUID Generator creates RFC-style version 4 UUIDs (random) one at a time or in bulk for application IDs and test fixtures. Developers searching "UUID generator", "GUID generator", or "uuid v4 online" need unique identifiers without standing up extra infrastructure.

Set the count and generate. v4 UUIDs are random; collision risk is extremely low for normal app volumes but they are not sorted by time (use ULID/UUIDv7 patterns when locality matters).

UUIDs are identifiers, not authentication secrets. Do not assume secrecy from unpredictability alone in security designs.

A generation helper - not a coordination service for distributed ID allocation policies.

Benefits of UUID Generator

UUID v4 focus Widely supported random UUIDs.
Bulk generation Fill test databases quickly.
Copy-ready values Paste into code and seeds.
No backend required Generate in the browser instantly.

Frequently asked questions

What is UUID version 4?

A randomly generated UUID variant commonly used for opaque IDs.

Will two UUIDs ever clash?

Theoretically possible but negligible for typical systems; design still assumes uniqueness checks where critical.

Is a UUID a secret token?

No - treat access control separately.

Can I generate other versions?

This tool focuses on v4 as labelled on the page.

Uppercase or lowercase?

Both parse the same in most systems; pick a team convention.