Standard v4
count = 1hyphens = yescase = lower
Result: f47ac10b-58cc-4372-a567-0e02b2c3d479
UUID Generator
Create cryptographically random version-4 UUIDs (RFC 4122) using your browser’s secure random number generator. Choose how many to generate, whether to keep the standard hyphens, and the letter case. Generation is local and instant.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Compact form
count = 1hyphens = nocase = upper
Result: F47AC10B58CC4372A5670E02B2C3D479
Frequently asked questions
How random are these UUIDs?
Version 4 UUIDs use 122 random bits from your browser’s cryptographically secure random number generator (crypto.getRandomValues), the same source used for web crypto.
Could two generated UUIDs be identical?
Practically never. With 122 random bits, collisions are so unlikely that UUIDs are used as unique keys at global scale without coordination.
Does the generator need a server?
No — UUIDs are created locally in your browser. You can generate as many as you like with no network traffic.
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