UUID / GUID Generator
Free online UUID/GUID generator. Batch-create RFC-4122 version-4 UUIDs using a cryptographically secure random source, with options for uppercase and stripped hyphens. Ideal for database keys, test data and unique identifiers — offline, with no network calls. DeveloperRuns locally
Use this tool
How to use
- Set how many to generate (1–100).
- Optionally tick uppercase or remove hyphens.
- Click Generate and copy the whole batch.
Frequently asked questions
Can generated UUIDs collide?
UUID v4 is random across a space of about 2^122, so the collision probability is negligible — safe as a globally unique identifier.
Is the randomness secure?
It uses the browser's cryptographically secure random interface with no network, so values cannot be predicted or collected.
Is a no-dash value still a UUID?
It simply removes the display hyphens; the 32 hex digits are unchanged and many systems accept that form.