UUID Generator (GUID)

Generate unique UUIDs (Universally Unique Identifiers) for your development needs. Click to copy any UUID to your clipboard instantly.

Note: UUID is the official standard name. Microsoft calls them GUIDs - they're the same thing!

UUID v4Random

Randomly generated, most common

UUID v7Sortable

Time-based, lexicographically sortable

Uppercase Include Dashes

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Click the button above to generate your first UUID

About UUIDs

A UUID (Universally Unique Identifier) is a 128-bit number defined in RFC 4122, used to uniquely identify information in computer systems. The probability of generating duplicate identifiers is so small that it can be ignored for practical purposes.

UUID vs GUID - What's the Difference?

They're the same thing! Both refer to the exact same 128-bit identifier standard.

UUID (Universally Unique Identifier) - The official standard name defined in RFC 4122, used by most of the industry
GUID (Globally Unique Identifier) - Microsoft's terminology for the same concept, commonly used in .NET, SQL Server, and Windows development

The format, structure, and generation algorithms are identical. The only difference is the name. This tool generates standard UUID v4 identifiers, which work perfectly whether you call them UUIDs or GUIDs.

Common Use Cases

Database primary keys and unique identifiers
API request IDs and correlation tracking
Session identifiers and authentication tokens
File and resource identifiers
Distributed system unique identifiers
Message queue and event identifiers
Entity IDs in microservices architectures

UUID Versions

This tool supports two UUID versions:

UUID v4 (Random) - Randomly generated using cryptographic randomness. Most commonly used for general-purpose unique identifiers.
Example: 550e8400-e29b-41d4-a716-446655440000
UUID v7 (Sortable) - Time-based and lexicographically sortable. Perfect for database primary keys, event IDs, and distributed systems where chronological ordering matters. Includes a Unix timestamp in the first 48 bits, making them naturally sortable by creation time.
Example: 018e3c5e-1234-7abc-9def-0123456789ab

UUID Format

Standard format: xxxxxxxx-xxxx-Vxxx-yxxx-xxxxxxxxxxxx
Where 'V' indicates the version (4 or 7)

Why Use Sortable UUIDs (v7)?

Database Performance - Better index performance in databases compared to random UUIDs
Time-ordered - Natural chronological sorting without additional timestamp columns
Distributed Systems - Maintain order across multiple servers generating IDs
Debugging - Easy to identify when records were created just by looking at the UUID