UUID Generator

Generate universally unique identifiers (UUIDs) instantly with support for v1 and v4 formats

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are standardized by the Open Software Foundation (OSF) as part of the Distributed Computing Environment (DCE). The probability of generating duplicate UUIDs is so low that they can be considered unique for practical purposes.

A standard UUID is displayed as 32 hexadecimal digits, separated by hyphens into five groups:8-4-4-4-12for a total of 36 characters (32 alphanumeric characters and 4 hyphens).

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

How to Use This Tool

1

Choose UUID Version

Select between Version 4 (random) or Version 1 (timestamp-based) depending on your needs.

2

Set Quantity

Specify how many UUIDs you need (1-100). Perfect for bulk generation.

3

Configure Format

Choose whether to include hyphens and use uppercase or lowercase letters.

4

Generate & Copy

Click generate and copy individual UUIDs or all at once to your clipboard.

UUID Versions Explained

UUID Version 4 (Random)

The most commonly used UUID version. Generated using random or pseudo-random numbers.

  • ✓Completely random generation
  • ✓No coordination needed
  • ✓Best for most use cases

UUID Version 1 (Timestamp)

Generated using timestamp and MAC address (or random node ID in browsers).

  • ✓Time-ordered UUIDs
  • ✓Can be sorted chronologically
  • ✓Useful for database indexing

Common Use Cases

Database Primary Keys

Use UUIDs as primary keys in distributed databases to avoid ID conflicts across multiple servers

API Request IDs

Track and trace API requests across microservices with unique identifiers

Session Tokens

Generate secure, unpredictable session identifiers for user authentication

File & Resource Naming

Create unique filenames for uploads or temporary resources to prevent collisions

Distributed Systems

Generate IDs in distributed systems without central coordination

Testing & Development

Create test data with realistic unique identifiers for development and QA

Format Options

With Hyphens (Standard)

550e8400-e29b-41d4-a716-446655440000

The standard RFC 4122 format with hyphens separating groups

Without Hyphens

550e8400e29b41d4a716446655440000

Compact format without hyphens, useful for some databases

Uppercase

550E8400-E29B-41D4-A716-446655440000

Uppercase hexadecimal characters for specific requirements

Frequently Asked Questions

Are UUIDs truly unique?

While theoretically possible to generate duplicates, the probability is astronomically low. For UUID v4, there are 2^122 possible values (about 5.3 × 10^36), making collisions virtually impossible in practice.

Which UUID version should I use?

For most applications, UUID v4 (random) is recommended. Use UUID v1 (timestamp) when you need time-ordered IDs or want to optimize database indexing performance.

Can I use UUIDs as database primary keys?

Yes! UUIDs are excellent for distributed databases where you need to generate IDs independently across multiple servers. However, they use more storage space than sequential integers.

Are the generated UUIDs secure?

UUID v4 uses random generation and is suitable for most security purposes. However, for cryptographic applications, consider using dedicated cryptographic random number generators.