UUID Generator - Create Unique Identifiers Online
Generate UUID (Universally Unique Identifiers) online. Create version 1, 4, and other UUID formats instantly.
Keywords
UUID generator, GUID generator, unique identifier generator, UUID creator, random UUID
A UUID generator creates 128‑bit identifiers for distributed systems without a central authority. Use random (v4) UUIDs for database keys, object IDs, and tracing across services.
What is a UUID?
A UUID is a standardized 36‑character string (32 hex digits and 4 hyphens) that encodes 128 bits. Common variants include Version 1 (time‑based), Version 4 (random), and Version 5 (namespace‑name, SHA‑1). Random v4 UUIDs rely on high‑quality entropy to minimize collisions.
How generation works
The tool uses the browser’s crypto API to produce randomness and formats output according to RFC 4122. For time‑based variants, the identifier includes a timestamp and node information; for namespace‑based variants, a name is hashed within a given namespace to generate a stable ID.
About the UUID Generator
Use UUIDs for database keys, object identifiers, and distributed coordination. Consider sortable alternatives like ULID when ordering is important. Avoid leaking sensitive data through predictable or time‑derived fields in public contexts.
FAQ
Can UUIDs collide?
In theory yes, but the probability for v4 UUIDs is vanishingly small. Collisions are practically negligible for typical applications.
Should I use UUIDs as database primary keys?
Yes, with caveats. Use random v4 UUIDs for uniqueness; consider performance impacts on clustered indexes and use optimized forms if necessary.
UUIDs simplify distributed identity generation. Choose the version that fits your needs and be mindful of ordering and storage considerations.
UUID 생성기
애플리케이션에 대한 다양한 형식으로 고유 식별자 (UUID) 생성
구성
아직 uuid가 생성되지 않았습니다
UUID 버전을 선택하고 '생성'을 클릭하여 고유 식별자를 만듭니다.