Free Online UUID Generator
Generate one or up to 50 random UUID v4 identifiers in a single click. Copy them individually or all at once — perfect for seeding test data, creating database keys, or any time you need a guaranteed-unique identifier.
Number of UUIDs to generate: 5
What is a UUID?
A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit identifier formatted as 32 hexadecimal digits in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
Version 4 UUIDs (UUID v4) are generated using random or pseudo-random numbers. The probability of a collision is astronomically low — roughly 1 in 5.3 × 10³⁶ — making them safe to use as unique keys without any central coordination.
How to Use the UUID Generator
- Set the count using the slider — from 1 to 50 UUIDs at a time.
- Click Generate UUIDs to create a fresh batch.
- Copy individually by clicking the Copy button next to each UUID, or use Copy All to copy the entire list.
Common Use Cases
- Database primary keys: Use UUIDs instead of auto-increment integers to avoid collisions when merging data from multiple sources.
- Test data generation: Quickly produce a batch of unique IDs to seed development databases or unit tests.
- Session identifiers: Generate unpredictable session tokens for authentication flows.
- File naming: Rename uploaded files with UUIDs to prevent collisions in storage buckets.