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UUID Generator

Generate random v4 UUIDs in bulk

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About This Calculator

UUID (Universally Unique Identifier) is a 128-bit identifier standard used to uniquely identify resources without a central authority. This generator creates UUID v4 identifiers, which are based on random numbers. UUID v4 is the most commonly used version and is suitable for database primary keys, session identifiers, API idempotency keys, and any situation where you need a globally unique ID without coordinating with a central server. The tool generates one or more UUIDs at a time, and you can copy them with a single click. Each UUID follows the standard 8-4-4-4-12 hexadecimal format (e.g., 550e8400-e29b-41d4-a716-446655440000).

How to Use

  1. 1
    Set quantity
    Enter how many UUIDs you want to generate at once.
  2. 2
    Generate UUIDs
    Click Generate to create random UUID v4 identifiers.
  3. 3
    Copy and use
    Copy the UUIDs to your clipboard for use in your project.

Frequently Asked Questions

Q. What version of UUID does this tool generate?
This tool generates UUID version 4 (v4), which is based entirely on random numbers. UUID v4 is the most widely used version and is suitable for the vast majority of use cases where you need unique identifiers.
Q. Can two UUIDs ever collide?
UUID v4 has 122 random bits, producing 5.3 x 10^36 possible values. The probability of collision after generating 1 billion UUIDs is approximately 1 in 10^18. For practical purposes, UUID collisions are impossible in real-world applications.
Q. Should I use UUID or auto-increment IDs for database primary keys?
UUIDs are better for distributed systems, avoiding ID conflicts across nodes without coordination. Auto-increment IDs are simpler, smaller (8 bytes vs 16), and produce better index locality. The best choice depends on your architecture and whether you need to generate IDs across multiple servers.

Disclaimer: Results are for informational purposes only and do not constitute professional advice. Always consult qualified professionals for important decisions.

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