UUID Generator
Generate version 4 UUIDs instantly. Choose count, casing, and hyphen format — copy individually or all at once.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems without requiring a central authority to manage the IDs. UUID version 4 — the most common type — is randomly generated, giving it 2¹²² possible values. The probability of generating the same UUID twice is astronomically small, making UUIDs ideal for database primary keys, session tokens, API request IDs, and distributed systems where uniqueness must be guaranteed across multiple servers.
How to use the UUID Generator
- 1Select how many UUIDs to generate: 1, 5, 10, 25, 50, or 100.
- 2Choose uppercase or lowercase format.
- 3Toggle hyphens on or off as needed.
- 4Click "Generate" and copy individual UUIDs or use "Copy All" for the full list.
Common uses
- →Generating database primary keys for PostgreSQL, MySQL, or MongoDB
- →Creating unique session tokens and API request identifiers
- →Seeding test databases with realistic unique IDs
- →Identifying records in distributed systems and microservices
Frequently asked questions
+What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. Version 4 UUIDs are randomly generated.
+Are generated UUIDs truly unique?
UUID v4 has 2^122 possible values (~5.3×10^36), making the probability of collision astronomically small. They are considered unique for all practical purposes.
+What is the difference between UUID and GUID?
GUID (Globally Unique Identifier) is Microsoft's term for UUID. They are the same format and serve the same purpose.