Developer Tools•Free & Browser-Based
UUID Generator
Generate cryptographically secure RFC 4122 Version 4 UUIDs (Universally Unique Identifiers) in bulk with case and hyphen controls.
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What is the Free Online UUID Generator?
A Universally Unique Identifier (UUID) is a 128-bit label used for identifying information in computer systems. Version 4 UUIDs are generated using pseudo-random numbers with $5.3 \times 10^{36}$ possible combinations, making collisions mathematically negligible.
100% Client-Side Privacy: Calculations and data processing occur entirely in your local browser memory. Zero files or personal inputs are uploaded to our servers.
How to Use UUID Generator Online: Step-by-Step Guide
- 1Specify how many UUIDs to generate (1 to 100).
- 2Choose whether to include hyphens and select Uppercase or Lowercase.
- 3Click "Generate UUIDs" or copy the entire list with one click.
Pro Tips for Getting Accurate Results
- •V4 UUIDs use `crypto.getRandomValues()` for true cryptographic randomness.
Frequently Asked Questions About UUID Generator
To have a 50% probability of a single collision, you would need to generate approximately 2.71 quintillion UUIDs.
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