UUID Generator — Free Online Tool

UUID Generator · Free online tool · 100% offline · No data collection Open in App

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What is UUID Generator?

UUID Generator is a free online tool that creates universally unique identifiers (UUIDs) in versions 1 and 4, plus ULIDs. UUIDs are 128-bit identifiers used everywhere in software — database primary keys, API request IDs, distributed systems, and authentication tokens. Generate single UUIDs or batches of thousands, instantly and offline.

How to use UUID Generator

1 Select UUID version — v4 (random) is most common, v1 includes timestamp

2 Click Generate for a single UUID, or set a batch count for multiple

3 Copy individual UUIDs or export the full list

4 Optionally generate ULIDs for sortable, URL-safe identifiers

Common use cases

Creating unique primary keys for database records
Generating request IDs for API tracing and logging
Creating unique filenames for user uploads
Setting up distributed systems with collision-free identifiers

Frequently Asked Questions

UUID v1 vs v4 — which should I use?

v4 (random) is best for most cases — truly random, no privacy concerns. v1 includes MAC address and timestamp, useful when you need chronological sorting.

What is a ULID?

ULID is a modern alternative to UUID — 26 characters, URL-safe, sortable by creation time. Great for database primary keys and public-facing IDs.

Are these UUIDs truly unique?

Yes. UUID v4 uses cryptographically strong randomness — the probability of collision is astronomically low (1 in 2^122).

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