Free Tools /Development
UUID Generator (v4, Bulk)
Generate up to 500 random UUID v4 at once, standard, compact or braced, ready to copy.
- Free, no signup
- Runs in your browser
- Nothing stored
Calculating…
Who uses it, and for what
Seed a test database or fixtures with unique ids.
Create idempotency keys for API calls that must never run twice.
Give rows in a spreadsheet a stable unique id before importing them.
How this tool works
Cryptographically random
Uses crypto.randomUUID(), the browser's secure random generator.
Version 4 format
122 random bits: collisions are practically impossible.
Bulk and formatted
Up to 500 at a time, in the format your system expects.
Frequently asked questions
Are these UUIDs unique?
Practically, yes. The chance of two random v4 UUIDs colliding is negligible even across billions.
v4 or v7?
v4 is random. v7 starts with a timestamp, which sorts better in databases. v4 is the most widely accepted.
Are they stored?
No. They are generated in your browser and disappear when you leave.
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