UUID Generator
Generate RFC 4122 compliant UUIDs (v1, v4, v5) with bulk generation and export—perfect for databases, APIs, and distributed systems.
Our UUID Generator creates RFC 4122 compliant universally unique identifiers in v1 (timestamp-based), v4 (random), and v5 (name-based) formats. Features bulk generation (up to 50), individual copy buttons, and export to JSON/CSV/TXT—ideal for database primary keys, API identifiers, and distributed systems.
Frequently Asked Questions
What is a UUID and why use it?
A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. UUIDs are used as database primary keys, API identifiers, session tokens, and distributed system references because they're globally unique without central coordination—eliminating ID collision risks.
What's the difference between UUID versions?
v1 uses timestamp + MAC address (traceable, sortable); v4 uses random generation (most common, 122 random bits); v5 uses namespace + name with SHA-1 (deterministic, same input = same UUID). Choose v4 for general use, v1 for time-ordered IDs, v5 for reproducible identifiers.
Are generated UUIDs truly unique?
UUIDs have extremely low collision probability. v4 has 2^122 possible values (~5.3×10^36), making random collisions virtually impossible. Our generator uses crypto.randomUUID() for cryptographically secure randomness, ensuring production-grade uniqueness.
Can I generate multiple UUIDs at once?
Yes! Generate up to 50 UUIDs per batch. Each UUID is individually copyable, or export all as JSON (with metadata), CSV (spreadsheet-ready), or TXT (line-separated) for bulk imports into databases or scripts.
How do I use v5 name-based UUIDs?
v5 requires a namespace UUID and a name string. Same namespace + name always produces the same UUID, useful for deterministic ID generation. Example: namespace 'dns' + name 'example.com' always yields the same v5 UUID.
Are UUIDs safe for production databases?
Yes! RFC 4122 UUIDs are production-ready for primary keys, especially in distributed systems where auto-increment IDs fail. They're generated client-side, never stored on our servers, and compatible with PostgreSQL, MySQL, MongoDB, and most databases.