UUID Generator
Generate cryptographically secure UUIDs.
About this tool
The UUID Generator creates version 4 UUIDs (universally unique identifiers) for use in databases, APIs, software development, and any context requiring a unique string identifier.
How it works
- Select how many UUIDs you need (1 to 100).
- Click Generate to produce them instantly.
- Copy a single UUID or the entire batch with one click.
- Use the UUIDs directly in your code, database records, or API requests.
Example use cases
- Database primary key: Generate a UUID to use as a primary key for a new user record, avoiding sequential integer IDs that leak record counts.
- API idempotency key: Generate a UUID per API request to use as an idempotency key, preventing duplicate processing of retried requests.
Frequently asked questions
What is the difference between UUID v4 and other versions?
v4 UUIDs are randomly generated. v1 uses the MAC address and timestamp. v5 uses a namespace and a hash. v4 is the most widely used for general-purpose unique IDs.
Can two generated UUIDs ever be the same?
In theory yes, but the probability is astronomically small (1 in 2^122). In practice, UUID collisions are not a real concern.