UUID Generator

Generate cryptographically secure UUID v4 identifiers for databases, APIs, distributed systems, authentication, session management and enterprise software.

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Formatting Options

Uppercase Output Remove Hyphens

fact_check UUID Validator

help What is a UUID?

A Universally Unique Identifier (UUID) is a 128-bit number used to identify information in computer systems. The standard representation is a string of 32 hexadecimal digits separated by hyphens (e.g., `550e8400-e29b-41d4-a716-446655440000`).

Version 4 UUIDs are generated pseudo-randomly. The chance of generating two identical v4 UUIDs is practically zero, making them perfect for decentralized systems.

compare_arrows UUID vs Auto-Increment

Unlike auto-incrementing database IDs (1, 2, 3...), UUIDs are non-sequential. This prevents malicious users from predicting other database records or discovering the size of your database (e.g. knowing you only have 10 users).

They can also be generated by the client application safely without requiring a round-trip to the database to fetch the next ID.

Common Enterprise Use Cases

database Primary Keys

key API Tokens

cookie Session IDs

security Authentication

folder File Identifiers

lan Distributed Systems

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Security Notice

UUIDs are generated entirely inside your browser using modern cryptographic browser APIs (`crypto.randomUUID()`). No information is stored or transmitted.