"author": {
      "@type": "Organization",
      "name": "Online UUID Generator"
    },
    "publisher": {
      "@type": "Organization",
      "name": "Online UUID Generator"
    },
    "mainEntityOfPage": {
      "@type": "WebPage",
      "@id": "https://online-uuid-generator.com/versions/v4/"
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  }

---

Online UUID Generator - Version 4

UUID Version 4 generates identifiers using random or pseudo-random numbers. This version is designed to provide a completely unique ID without relying on system information like timestamps or MAC addresses.

Pros:

• Highly Random: The use of random numbers ensures a very low probability of collisions, making it ideal for general-purpose unique identifiers.
• No Privacy Concerns: Since it doesn't use any device-specific information, there are no privacy issues.

Cons:

• Not Deterministic: The same inputs will produce different UUIDs, which may not be suitable for all use cases.
• Non-Sortable: UUID v4 values are purely random, so they cannot be sorted chronologically or lexicographically.

Best for: Use cases that require a large number of unique IDs without any dependencies on the generating system, such as database keys or tokens.

When to Choose UUID v4

Perfect for:

• Database primary keys
• API tokens and session IDs
• File names and temporary identifiers
• Any scenario requiring unpredictable IDs

Consider alternatives if you need:

• Sortable IDs: Use UUID Version 7 for time-ordered sorting
• Deterministic IDs: Use UUID Version 5 for consistent results
• Legacy compatibility: Use UUID Version 1 for older systems

Related UUID Versions

Compare with other versions:

• UUID Version 1 - Time-based with MAC address
• UUID Version 3 - MD5 namespace-based
• UUID Version 5 - SHA-1 namespace-based
• UUID Version 6 - Time-ordered sortable
• UUID Version 7 - Modern time-based

Most popular implementation guides:

• JavaScript - Frontend and backend web development
• Python - Data science and web frameworks
• Java - Enterprise applications and Spring Boot
• PHP - Laravel, Symfony, and WordPress development
• Go - Cloud-native and microservice architectures
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