Tools / UUID Generator

UUID Generator

Generate random UUID v4 identifiers in bulk — created locally, never transmitted.

What is a UUID v4?

  1. A UUID v4 is a 128-bit random identifier — 122 random bits give about 5.3×10³⁶ possibilities.
  2. The chance of two colliding is so small that databases, APIs and distributed systems use v4 as unique IDs.
  3. Pick options above if you need uppercase, braced or hyphen-free variants.

Frequently asked questions

Are these cryptographically secure?

Yes — generated with your browser's crypto.getRandomValues(), suitable even for secret tokens.

Can I use them as database primary keys?

You can, though for very large tables consider ordered IDs (like ULID) to reduce index fragmentation — v4 is random by design.

Is there a limit on how many I can generate?

No. Generation is local and instant; the display caps at a few hundred per batch for readability.