UUID Generator
Generate random UUID v4 identifiers for development.
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How to Use This Tool
- Click 'Generate' to create a random UUID v4 identifier.
- Set the number of UUIDs to generate multiple at once.
- Click any UUID to copy it to your clipboard.
- Use UUIDs as unique identifiers for database records, API keys, or session tokens.
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Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUID v4, the most common version, uses random numbers to generate identifiers with an extremely low collision probability.
How unique are UUID v4 identifiers?
The chance of generating two identical UUID v4 values is approximately 1 in 5.3 × 10^36. You would need to generate billions of UUIDs per second for billions of years to have even a small chance of collision.
Are these UUIDs cryptographically secure?
Yes. This tool uses the Web Crypto API's cryptographically secure random number generator (crypto.getRandomValues) to produce UUIDs that are not predictable.
Can I generate UUIDs offline?
Yes. All UUID generation happens locally in your browser. No internet connection is needed after the page loads.
What version of UUID does this tool generate?
This tool generates UUID version 4 (random), which uses random or pseudo-random numbers. A v4 UUID has the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where the probability of duplicates is practically zero.