UUID Generator

Generate universally unique identifiers (UUIDs) for your applications, databases, and systems

UUID Generator

Generated: Just now

UUID Version

Number of UUIDs

Formatting Options

Uppercase

Include Hyphens

Include Braces

URI-safe Format

Namespace (for v3/v5)

Name (for v3/v5)

550e8400-e29b-41d4-a716-446655440000

Version 4 UUID

Generation History

550e8400-e29b-41d4-a716-446655440000

About UUID Generator

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. Our UUID Generator creates these unique identifiers according to the RFC 4122 specification.

Supported UUID Versions:

Version 1 (Timestamp-based) - Generated using timestamp and MAC address
Version 3 (MD5 Hash) - Generated by hashing a namespace and name with MD5
Version 4 (Random) - Generated using random numbers (most common)
Version 5 (SHA-1 Hash) - Generated by hashing a namespace and name with SHA-1

Unique Identifiers

Generate globally unique IDs with extremely low collision probability

Multiple Formats

Customize output with uppercase, hyphens, braces, and URI-safe options

History Tracking

Keep track of all generated UUIDs during your session

Secure & Private

All generation happens locally in your browser - no server interaction

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by the Open Software Foundation. It's designed to be unique across both space and time, with negligible chance of duplication.

Which UUID version should I use?

Version 4 (random) is the most commonly used and is suitable for most applications. Version 1 is timestamp-based and may reveal information about when and where it was generated. Versions 3 and 5 are name-based and useful when you need reproducible UUIDs from the same input.

Are UUIDs really unique?

While theoretically possible to have duplicates, the probability is extremely low (about 1 in 2¹²² for version 4). In practice, UUIDs can be considered unique for most practical purposes.

What is the difference between UUID and GUID?

UUID and GUID (Globally Unique Identifier) are essentially the same thing. GUID is Microsoft's implementation of the UUID standard.

Can I use UUIDs in URLs?

Yes, especially with the URI-safe format option. UUIDs are often used in REST APIs and web applications to identify resources without revealing database IDs.

Is this tool secure?

Absolutely! All UUID generation happens locally in your browser. Your data never leaves your device, ensuring complete privacy and security.