UUID Generator
Instantly generate UUID, free and secure.
The UUID Generator creates universally unique identifiers (UUIDs) instantly, directly in your browser. Generate one or many at a time for use in databases, APIs, or distributed systems.
UUIDs provide a way to generate unique IDs without a central coordinating authority, making them ideal for distributed systems, database primary keys, and session tokens.
How to Generate a UUID
- Click Generate
- Copy the resulting UUID
- Generate multiple UUIDs at once if needed
Best Practices
- Standard UUIDs (v4) are effectively collision-free for practical purposes — safe to use as unique keys
- Store UUIDs consistently (with or without hyphens) across your system to avoid mismatches
This tool is free to use with no signup required.
Frequently Asked Questions
How unique is a generated UUID?
Standard v4 UUIDs have such a large possible value space that collisions are astronomically unlikely in practice.
Can I generate multiple UUIDs at once?
Yes, the tool supports generating a batch of UUIDs in a single click.
The UUID Generator creates universally unique identifiers — 128-bit values used to label data so that no two generated IDs collide, even across different systems generating them independently.
Why UUIDs Instead of Simple Incrementing IDs
A traditional auto-incrementing integer ID only guarantees uniqueness within a single database table. The moment you have multiple databases, distributed services, or offline-generated records that need to merge later, incrementing IDs collide. UUIDs solve this by being statistically unique across any system, generated at any time, without needing a central authority to hand out the next available number.
UUID Versions and What They Mean
- Version 4 (random) — the most commonly generated type, built almost entirely from random bits; this is what most general-purpose UUID generators produce by default.
- Version 1 (timestamp-based) — incorporates the current timestamp and network identifier, meaning UUIDs generated in sequence are sortable by creation time, but can leak information about when and where they were generated.
- Version 5 (name-based) — deterministically generated from a namespace and a name, meaning the same input always produces the same UUID, useful when you need a stable, repeatable identifier derived from existing data.
Common Use Cases
Database primary keys in distributed systems, session tokens, API request tracing IDs, file names that must never collide, and unique identifiers for records synced between offline devices and a central server.
