How to Use the UUID Generator

Select the UUID version you need — v4 (random) is the default and most commonly used.

Choose how many UUIDs to generate if you need a batch.

Copy the output individually or all at once.

What Is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier standardized in RFC 4122, formatted as 32 hexadecimal characters in five groups separated by hyphens — e.g., 550e8400-e29b-41d4-a716-446655440000. The most widely used variant is UUID v4, which is randomly generated and has a collision probability so low it's effectively zero for any practical application. UUID v1 incorporates a timestamp and MAC address. UUIDs are used wherever a unique identifier is needed without a central authority — database primary keys, session tokens, file names, message IDs, and more.

When to Use This Tool

Database primary keys — Generate UUIDs to use as unique row identifiers in place of auto-incrementing integers, particularly useful in distributed systems where two nodes can't coordinate on the next integer.

Testing and seeding — Quickly generate a batch of UUIDs for populating test fixtures, mock data, or database seeds.

Session and request IDs — Use UUIDs as unique identifiers for user sessions, API requests, or trace IDs in logging systems.

File naming — Generate collision-safe filenames for uploaded files or generated assets.

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