🆔 UUID Generator

Generate UUID v4 values for database records, APIs, tests, distributed systems, and unique references.

Free Instant results No sign-up needed
What This Tool Does

UUID generation: Creates version 4 (random) UUIDs—128-bit identifiers designed to be unique across space and time. Each UUID has 32 hexadecimal digits in 5 hyphen-separated groups.

Structure: Format is 8-4-4-4-12 (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx) where each x is a hexadecimal digit (0-9, a-f).

Uniqueness: Generates random-looking UUID v4 values for general development and testing. The current browser function uses Math.random, so do not treat it as cryptographically secure.

Version 4: Random UUID variant—the most common type. No timestamps or MAC addresses, ideal for web apps and privacy-conscious systems.

What This Tool Does

UUID v4: Generates random UUID v4 strings in the standard 8-4-4-4-12 format.

Quick output: Generate one UUID or five UUIDs at a time and copy the textarea output.

Implementation note: The current UUID function uses Math.random in the browser, so it should not be described as cryptographically secure.

What is a UUID?

A UUID, or Universally Unique Identifier, is a standardized identifier often used to label records, resources, sessions, events, and test data without relying on a central sequence.

UUID vs GUID

GUID is a term commonly used in Microsoft ecosystems for UUID-style identifiers. In everyday development, UUID and GUID often refer to compatible 128-bit identifier formats, though details can vary by platform.

How to Generate UUIDs

  1. Click Generate one to create a single UUID v4.
  2. Click Generate 5 to create five UUIDs separated by line breaks.
  3. Use the copy button to copy the textarea output.

Common Use Cases

  • Database identifiers where central sequencing is not convenient.
  • API request IDs and object references.
  • Distributed systems that need locally generated identifiers.
  • Test fixtures, sample payloads, and development data.

UUID Version Implemented

The interface labels the generated values as UUID v4. The current implementation sets the version and variant bits in the UUID string but uses Math.random for random values, so it should be used for general development/testing rather than high-security identifier generation.

Privacy and Processing

UUID generation happens in the browser and does not submit data to a Laravel processing endpoint.

UUID Generator FAQ

What is a UUID?

A UUID is a Universally Unique Identifier, commonly represented as 32 hexadecimal digits separated into five hyphenated groups.

What is a GUID?

GUID is a term often used in Microsoft ecosystems for UUID-compatible identifiers. Practical differences depend on the platform and context.

What is UUID v4?

UUID v4 is the random UUID version. It uses random bits plus version and variant markers to produce the standard UUID format.

Are UUIDs unique?

UUIDs are designed to make collisions extremely unlikely, but uniqueness depends on correct generation and is not the same as a central database guarantee.

How many UUIDs can I generate?

The current interface generates one UUID or five UUIDs at a time. You can click again to create more.

Which UUID version should I use?

Use UUID v4 when you need random identifiers without embedded time or machine information and your system accepts that format.

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