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Guide

How to use this tool, examples, and related tips.

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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FAQ

Answers about this tool and how your data is handled.

What is the difference between UUID v1 and v4?

UUID v1 is generated from the current timestamp and the device's MAC address — it's time-ordered but can leak system information. UUID v4 is randomly generated with no embedded system data. For most use cases, v4 is preferred.

Are these UUIDs truly unique?

UUID v4 has 122 bits of randomness. The probability of a collision across two randomly generated v4 UUIDs is astronomically small — effectively zero for any real-world application.

Is this tool suitable for generating UUIDs for production use?

Yes. The UUIDs are generated client-side using the browser's cryptographically secure random number generator. They are suitable for use as identifiers in production systems.

Does this tool send my data to a server?

No. UUIDs are generated entirely in your browser. Nothing is sent to any server.

Can I generate UUIDs in bulk?

Yes. Use the batch count input to generate multiple UUIDs in a single operation.

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