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UUIDv4 Generator

Generate random version 4 UUIDs (Universally Unique Identifiers) instantly. Perfect for database keys, unique identifiers, and development testing.

Number of UUIDs
1 50
Quick Count Generate multiple

đź’ˇ How to Use This Tool

Generate random UUIDs instantly with these simple steps:

1

Choose Quantity

Use the slider or dropdown to select how many UUIDs you need (1-50).

2

Set Format Options

Toggle uppercase letters or remove dashes based on your requirements.

3

Generate UUIDs

Click the Generate button to create your random UUIDs instantly.

4

Copy & Use

Copy individual UUIDs or all at once with a single click.

đź“– About UUIDv4 Generator

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. UUIDs are standardized by the Open Software Foundation (OSF) and defined in RFC 4122.

UUID Version 4 (UUIDv4)

Version 4 UUIDs are randomly generated. They contain 122 random bits and 6 fixed bits that identify the version and variant. The format is:

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

Where:

  • x is any hexadecimal digit (0-9, a-f)
  • 4 indicates this is a version 4 UUID
  • y is one of 8, 9, a, or b (variant bits)

Common Use Cases

  • Database Primary Keys: Use UUIDs instead of auto-incrementing integers for distributed systems
  • Session Identifiers: Generate unique session tokens for web applications
  • File Names: Create unique file names to prevent collisions
  • API Keys: Generate temporary or permanent API identifiers
  • Distributed Systems: Ensure uniqueness across multiple servers without coordination
  • Testing: Generate mock data with realistic unique identifiers

Why Use UUIDs?

Advantages

  • Globally Unique: No central authority needed for generation
  • Non-Sequential: Cannot be guessed or enumerated
  • Mergeable: Easy to merge data from different sources
  • Portable: Standard format works across all platforms

Collision Probability

The probability of generating two identical UUIDv4s is astronomically low—about 1 in 5.3 × 10^36. You would need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of a collision.

Privacy & Security

This generator uses the Web Crypto API (crypto.randomUUID() or crypto.getRandomValues()) for cryptographically secure random number generation. All UUIDs are generated entirely in your browser—nothing is sent to any server.

âť“ Frequently Asked Questions

Yes! This generator uses the Web Crypto API (crypto.randomUUID() or crypto.getRandomValues()) which provides cryptographically secure random numbers. All UUIDs are generated entirely in your browser—nothing is sent to any server.
UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are essentially the same thing. GUID is the term used by Microsoft, while UUID is the standard term used in most other contexts. Both follow the same RFC 4122 specification.
Theoretically, yes, but practically, no. The probability of generating two identical UUIDv4s is about 1 in 5.3 Ă— 10^36. You would need to generate 1 billion UUIDs per second for 85 years to have just a 50% chance of a collision.
UUIDs are generated in the standard format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where x is any hexadecimal digit (0-9, a-f), 4 indicates version 4, and y is one of 8, 9, a, or b (variant bits).
Yes! This UUID generator is completely free with no usage limits. Generate as many UUIDs as you need without any signup or registration required.