Generate RFC 4122 compliant UUID v4 identifiers instantly — in bulk, in any format, entirely in your browser.
9ddf542c-e6f4-4b63-8f82-9904285c3e80Copy999733e5-dd0a-4656-8246-50d0a6ba6fe1Copy5ab3a58f-31a6-4172-826b-526b77dc894fCopyc35a67db-86fd-467f-b284-0c7d917cab57Copy13e25a32-7cbe-42dc-b397-e68266a24335Copyd7a283b8-2db6-4e3b-b5e3-d77d26f7bff5Copy67d5cebd-1262-4d45-a55d-92613aa9b3abCopy354e6f13-7b91-4c72-ab13-cf6304c0b7a5Copy03988527-64b8-4c5b-94ed-75ee173915f1Copy39116022-bea7-419a-930f-766bfbc4370dCopyA UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. It takes the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx — 32 hexadecimal digits split into 5 groups. UUID v4 uses random bits, making collisions practically impossible (odds: 1 in 2122).
This generator uses the browser's Web Crypto API — no server calls, no tracking, no logs.
UUIDs are ideal as primary keys in distributed databases. Unlike auto-increment IDs, they are globally unique without coordination between nodes.
Use UUIDs as resource identifiers in REST APIs. They are opaque, non-sequential, and expose no internal ordering information to clients.
Quickly stub UUIDs for test fixtures, mock data, or database seeds. The bulk generator lets you copy 100 IDs in one click.
Name uploaded files, S3 objects, or cache keys with UUIDs to avoid collisions and make names unpredictable and unguessable.
550e8400-e29b-41d4-a716-446655440000Standard lowercase RFC 4122 format. Used in most contexts.550E8400-E29B-41D4-A716-446655440000Same as plain but uppercased. Some .NET and Windows APIs expect this.{550e8400-e29b-41d4-a716-446655440000}Curly-brace wrapped. Required by some COM, OLE, and Windows Registry contexts.["550e8400-…", "f47ac10b-…"]Ready-to-paste JSON array. Copy directly into config files, fixtures, or API mocks.