UUID Generator
Generate RFC 4122 UUID v4 values in bulk, with options for count, uppercase and hyphen-free formatting.
Generated UUIDs
0
This tool runs entirely in your browser. Your input is never uploaded.
How to use
- 1Drag the slider to choose how many UUIDs to generate
- 2Toggle uppercase or hyphens if you need a different format
- 3Copy the list, or click Regenerate for a new batch
FAQ
Will the UUIDs ever repeat?
UUID v4 carries 122 random bits, so collisions are astronomically unlikely — safe for primary keys and request IDs.
Does formatting affect uniqueness?
No. Uppercase and hyphen toggles change display only; the underlying value stays the same.
Which random source is used?
crypto.randomUUID when available, otherwise crypto.getRandomValues with the v4 version and variant bits set.
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