UUID/GUID Generator

Generate unique identifiers (UUID/GUID) with customizable formats

UUID Version:

Select UUID version to generate

Quantity:

Number of UUIDs to generate (1-100)

Case:

Lowercase Uppercase

Hyphens:

Include hyphens

Braces:

Include braces { }

Generated UUIDs:

0 UUIDs

UUID Validator

Enter UUID to validate:

UUID/GUID Generator Documentation

UUID Versions

Version 1 (Timestamp-based)

Generated using the current timestamp and MAC address. Contains time information and can be traced back to the generating machine.

Example: 6ba7b810-9dad-11d1-80b4-00c04fd430c8

Version 4 (Random)

Generated using random or pseudo-random numbers. Most commonly used version due to simplicity and no privacy concerns.

Example: 550e8400-e29b-41d4-a716-446655440000

NIL UUID

A special UUID consisting of all zeros, used to represent an empty or null UUID value.

Example: 00000000-0000-0000-0000-000000000000

UUID Format

A UUID is typically represented as a 36-character string in the format: 8-4-4-4-12 hexadecimal digits

xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx

M: Indicates the UUID version (1, 4, etc.)
N: Indicates the UUID variant (always 8, 9, a, or b)
x: Any hexadecimal digit (0-9, a-f)

Common Use Cases

Database Primary Keys

Use UUIDs as primary keys to ensure uniqueness across distributed databases without central coordination.

Session Management

Generate unique session identifiers for web applications to track user sessions securely.

File Naming

Create unique file names for uploads to prevent conflicts and ensure file uniqueness.

Distributed Systems

Identify entities in distributed systems without requiring coordination between nodes.

Best Practices

Use Version 4 (random) for most applications due to simplicity and privacy
Use Version 1 only if timestamp information is required
Store UUIDs in binary format in databases for better performance
Validate UUID format before processing to ensure data integrity
Consider collision probability: while extremely low, always handle duplicates gracefully
Use lowercase format for consistency unless uppercase is specifically required

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