UUID Generator

Generate random UUIDs (v4)

What is UUID Generator?

The UUID Generator is a free online tool that creates universally unique identifiers (UUIDs) instantly in your browser. A UUID is a 128-bit number formatted as a 36-character string like 550e8400-e29b-41d4-a716-446655440000, and it is designed to be unique across all computers and all time without requiring a central authority to coordinate. UUIDs are essential in modern software development for database primary keys, session identifiers, file names, transaction IDs, and distributed system coordination. This tool generates UUID version 4, which uses cryptographically secure random numbers to ensure each generated ID is statistically unique. You can generate a single UUID or multiple UUIDs at once, and copy them with one click for immediate use in your code, database, or configuration.

Why Use DevBench UUID Generator?

DevBench UUID Generator runs entirely in your browser — your data never leaves your device. No sign-up, no limits, no watermarks, completely free forever.

How to Use UUID Generator

  1. Click "Generate UUID" to create a new UUID v4
  2. Click "Generate Multiple" to create several UUIDs at once
  3. Copy individual UUIDs using the Copy button
  4. Use UUIDs as unique identifiers in databases
  5. Generate as many UUIDs as needed - they are virtually unique

Examples

  • Generate UUID for database primary key: 550e8400-e29b-41d4-a716-446655440000
  • Create unique session IDs for web applications
  • Generate unique filenames for uploaded files
  • Create unique transaction IDs for payment systems
  • Generate unique identifiers for distributed systems

Use Cases

  • Creating unique database primary keys
  • Generating session IDs for web applications
  • Creating unique filenames for file uploads
  • Generating transaction IDs for payment systems
  • Creating unique identifiers for API requests
  • Generating unique IDs for distributed systems
  • Creating correlation IDs for microservices
  • Generating unique device identifiers
  • Creating unique order numbers for e-commerce
  • Generating unique identifiers for IoT devices

Frequently Asked Questions

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems.

Are UUIDs truly unique?

While not mathematically guaranteed, the probability of collision is so low (1 in 2^122) that UUIDs are considered unique.

What is UUID v4?

UUID v4 is randomly generated using cryptographically secure random numbers, making it the most common UUID version.

Can I use UUIDs as database keys?

Yes, UUIDs are excellent for database primary keys, especially in distributed systems where auto-increment IDs are problematic.

How many UUIDs can I generate?

You can generate unlimited UUIDs. The total possible UUIDs is 2^122 (5.3 x 10^36), far more than needed.