UUID/GUID Generator

Generate universally unique identifiers in various formats and versions

UUID Version

UUID v4 (Random): Randomly generated UUID using cryptographically secure random numbers. ✓ Recommended for general use.

Quantity (1-1000)

Format

UUID Parser & Decoder

Paste UUID to Analyze

About UUIDs

A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify information in computer systems. The term GUID (Globally Unique Identifier) is used interchangeably, particularly in Microsoft contexts.

Version	Method	Sortable	Use Case
v1	Timestamp + MAC	✓ Yes	Distributed systems (privacy concern)
v4	Random	✗ No	General purpose, session IDs
v5	Name + SHA-1	✗ No	Deterministic IDs from names
v7	Unix timestamp + random	✓ Yes	Database primary keys, modern apps

Best Practices:

Use UUID v4 for general-purpose unique identifiers
Use UUID v7 for database primary keys (better indexing performance)
Use UUID v5 when you need deterministic IDs from names
Avoid UUID v1 if MAC address exposure is a concern
Store UUIDs as binary (16 bytes) in databases for better performance

🔒 All UUIDs are generated client-side. No data is transmitted to any server.