UUID Generator
Generate random UUIDs (v4) individually or in bulk.
Result
Key features
Generate one or many random version 4 UUIDs at once, with optional uppercase formatting or hyphens removed — ready to copy straight into code, a database seed, or test data.
UUIDs are generated locally using your browser’s cryptographically secure random number generator. Nothing is sent anywhere.
How to use
Set a quantity and format
Choose how many UUIDs you need, and optional uppercase or no-hyphen formatting.
Generate
UUIDs are created instantly using your browser’s secure random number generator.
Copy them
Copy all at once, or copy a single UUID from the list.
Frequently asked questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier, usually shown as 32 hex digits split into 5 groups, that’s statistically unique enough to use without checking a central registry. This tool generates version 4 UUIDs, which are based entirely on random numbers.
How random are these?
They’re generated using the Web Crypto API (crypto.randomUUID / crypto.getRandomValues), a cryptographically secure random number source built into your browser — the same quality of randomness used for security-sensitive values, not a simple pseudo-random generator.
Are these UUIDs stored or logged anywhere?
No. They’re generated and displayed entirely in your browser — nothing is transmitted or saved.