UUID Generator
Generate cryptographically random RFC 4122 Version 4 UUIDs and GUIDs in bulk.
Generate universally unique identifiers (UUID Version 4) adhering to RFC 4122 specifications. Generate single or bulk UUIDs (up to 100 at once), toggle uppercase or lowercase, and include or remove hyphens.
About UUID / GUID Generator
UUIDs are essential in software development for primary keys in distributed databases, session identifiers, tracking tokens, and idempotency keys.
How to Use UUID / GUID Generator
- Select quantity: Choose how many UUIDs you need (1 to 100).
- Configure options: Toggle uppercase letters or remove hyphens if needed.
- Generate UUIDs: Click Generate to produce fresh cryptographic identifiers.
- Copy results: Copy individual UUIDs or copy the full bulk list.
Key Features
- RFC 4122 compliant Version 4 UUIDs
- Bulk generation (1 to 100 UUIDs)
- Uppercase or lowercase formatting
- With or without hyphens
- One-click copy all to clipboard
Common Use Cases
- Generating unique primary keys for database seeding and migrations.
- Creating random tracking tokens and order numbers for test environments.
- Setting mock entity IDs in unit testing and API prototypes.
Frequently Asked Questions
What is a Version 4 UUID?
A Version 4 UUID is a 128-bit universally unique identifier generated using random or pseudo-random numbers, formatted in 36 characters (32 hexadecimal digits and 4 hyphens).
Can two generated UUIDs ever collide?
The probability of generating two duplicate Version 4 UUIDs is practically zero (approximately 1 in 2^122), making them safe for global distributed databases.
What is the difference between a UUID and a GUID?
GUID (Globally Unique Identifier) is Microsoft’s terminology for a UUID. They are functionally identical.
Are these UUIDs suitable for database primary keys?
Yes! RFC 4122 Version 4 UUIDs are industry standard for distributed databases, MongoDB, PostgreSQL, and event-driven microservices.
Privacy Guarantee
UUIDs are generated directly inside your browser using window.crypto. Zero network requests.
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