"author": {
      "@type": "Organization",
      "name": "Online UUID Generator"
    },
    "publisher": {
      "@type": "Organization",
      "name": "Online UUID Generator"
    },
    "mainEntityOfPage": {
      "@type": "WebPage",
      "@id": "https://online-uuid-generator.com/versions/v3/"
    }
  }

---

Online UUID Generator - Version 3

UUID Version 3 generates identifiers based on a cryptographic hash (MD5) of a namespace and a user-defined name. This method ensures that the same inputs will always produce the same UUID, making it suitable for cases where deterministic IDs are needed.

Pros:

• Deterministic: Consistently generates the same UUID for the same input, which is useful for lookups.
• Collisions Avoidance: Low risk of collisions due to the use of the MD5 hashing algorithm.

Cons:

• Not Truly Random: Since it's based on hashing, UUID v3 is not suitable for use cases that require randomness.
• Weak Hashing: Uses MD5, which is considered weak by modern cryptographic standards. Consider Version 5 instead.

Best for: Generating unique IDs from a consistent source, such as namespaced resources (like file paths or usernames) where deterministic results are needed.

When to Choose UUID v3

Perfect for:

• Deterministic ID generation from consistent inputs
• Namespace-based resource identification
• Legacy systems requiring MD5 compatibility
• Reproducible unique identifiers

Consider alternatives if you need:

• Better security: Use UUID Version 5 with SHA-1 instead
• Random IDs: Use UUID Version 4 for unpredictable identifiers
• Time-based sorting: Use UUID Version 7 for chronological ordering

Related UUID Versions

Compare with other versions:

• UUID Version 1 - Time-based with MAC address
• UUID Version 4 - Random, most popular choice
• UUID Version 5 - SHA-1 namespace-based, more secure than v3
• UUID Version 6 - Time-ordered sortable
• UUID Version 7 - Modern time-based with improved sorting

Popular implementation guides:

• JavaScript - Web applications and Node.js APIs
• Python - Data processing and Django/Flask apps
• Java - Enterprise systems requiring deterministic IDs
• C# - .NET applications and microservices
• **View all languages →

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