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Processed locally in your browser

UUID Generator

Generate random, cryptographically strong UUID v4 identifiers — one at a time or in bulk.

Generated UUIDs

  

    
  



      

      
      
      
      

        
What Is a UUID?


A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit identifier designed to be unique across systems without central coordination. Version 4 UUIDs are generated using random numbers, making collisions extremely unlikely.

        
Example Calculation
A typical UUID v4 looks like 3fa85f64-5717-4562-b3fc-2c963f66afa6.

        
Formula / Calculation Method
UUID v4 sets fixed version (4) and variant bits, and fills the remaining 122 bits with cryptographically random data.

        
How to Use This Tool
  1. Choose how many UUIDs you need (1–100).
  2. Toggle hyphens and uppercase formatting as needed.
  3. Click Generate UUIDs.
  4. Copy all results with one click.

        
Common Use Cases
Generating unique database record IDs
Creating test data for development
Naming temporary files or sessions uniquely
API request or trace IDs

      

      
      

    
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Frequently Asked Questions
Are these UUIDs guaranteed to be unique?
UUID v4 uses 122 random bits, making the probability of a collision astronomically small for virtually all practical purposes.
Are the generated UUIDs sent to a server?
No — UUIDs are generated locally in your browser using a cryptographically secure random number generator.