ToolFoxUUID Generator
Generate one or many random v4 UUIDs using your browser's cryptographic randomness.
How it works
Each UUID is produced by the browser's built-in crypto.randomUUID(), which draws from a cryptographically secure random source and sets the version (4) and variant bits required by RFC 4122. With 122 random bits, the chance of two UUIDs ever colliding is negligible for any practical system.
Example
Need seed data? Set the count to 50 and press Generate — fifty unique IDs like 4f9d35c2-… appear instantly, ready to copy as one per line into a fixture file.
Frequently asked questions
Can two generated UUIDs collide?
The probability is about 1 in 5.3 undecillion per pair — treated as impossible in practice.
What is the difference between UUID and GUID?
None in practice — GUID is Microsoft's name for the same 128-bit identifier format.
Are these UUIDs predictable?
No — they come from the browser's secure random generator, not from timestamps or MAC addresses.
Do you log generated IDs?
No — generation is local; the IDs exist only on your device.
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