Unique Identifiers
UUID/GUID Generator
Generate unique identifiers (UUID/GUID) in various formats. Perfect for databases, APIs, and anywhere you need guaranteed unique IDs.
UUID v4 (Random)
Most commonly used UUID format with random generation for maximum uniqueness.
Click "Generate UUID v4" to create a unique identifier
(1-100)
UUID v1 (Timestamp-based)
Based on timestamp and MAC address. Provides temporal ordering but may reveal information about the generator.
Click "Generate UUID v1" to create a timestamp-based identifier
GUID (Microsoft Format)
Microsoft-style GUID format, typically used in Windows environments and .NET applications.
Click "Generate GUID" to create a Microsoft-style identifier
About UUIDs and GUIDs
UUID v4 (Random)
Uses random or pseudo-random numbers. Most widely used version due to its simplicity and lack of privacy concerns. Has 122 random bits.
UUID v1 (Timestamp)
Based on timestamp and MAC address. Guarantees uniqueness across space and time but may reveal the identity of the computer that generated it.
GUID Format
Microsoft's implementation of UUID, typically enclosed in braces and often uppercase. Functionally equivalent to UUID but with different formatting conventions.
Use Cases
Database primary keys, API request IDs, file names, transaction IDs, session identifiers, and anywhere unique identification is required.