UUID Generator

What is a UUID?

A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit identifier designed to be unique across space and time without any central coordination. It is written as 32 hexadecimal digits in five hyphen-separated groups, for example 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are generated from random numbers.

Our UUID Generator uses the browser's cryptographically secure random number generator (crypto.randomUUID), so the values are suitable for production use as database keys, request identifiers, and more. The probability of a collision between two v4 UUIDs is so vanishingly small it can be treated as zero in practice.

How to Generate UUIDs

• Use the slider to choose how many UUIDs to generate, up to 50 at once
• Toggle Hyphens off to produce a compact 32-character form
• Toggle Uppercase to get uppercase hexadecimal digits
• Click Regenerate or New set for a fresh batch of random values
• Copy a single UUID, or use Copy all to grab the whole list

Common Uses for UUIDs

Developers use UUIDs as primary keys in databases (especially distributed ones where auto-incrementing integers cause conflicts), as identifiers for API requests and log correlation, as filenames for uploaded assets, and as session or transaction IDs. Because they can be generated independently on any machine without coordination, they are ideal for distributed systems.

UUIDs also avoid the information leakage of sequential IDs — they do not reveal how many records exist or allow easy guessing of other identifiers, which is a useful privacy and security property.

Privacy

Every UUID is generated locally in your browser using the secure crypto API. Nothing is sent to or stored on a server, so the identifiers are private to you.