DEVELOPER TOOL
UUID Generator
Generate random version 4 UUIDs, one or many at a time.
About this tool
Generates random version 4 UUIDs (universally unique identifiers) using your browser's cryptographically secure random number generator. UUIDs are commonly used as database keys, request IDs, and unique identifiers in code where collisions need to be effectively impossible.
Frequently asked questions
- What does "version 4" mean?
- Version 4 UUIDs are generated from random bits (rather than derived from a timestamp or hardware address), following the standard RFC 4122 format — the version and variant bits are fixed, and the rest is random.
- How unique are these really?
- A version 4 UUID has 122 random bits, making accidental collisions astronomically unlikely — you could generate billions per second for centuries before a collision became statistically likely.
- Why would I remove the hyphens?
- Some systems or identifiers (like certain database keys or filenames) prefer a single unbroken string — turning off hyphens gives the same 32 hex characters without the standard dashes.