When to use a random UUID
A version 4 UUID is useful when separate systems need to create identifiers without asking a shared counter for the next number. It contains random bits plus fixed version and variant fields. It does not contain a creation time, and sorting these IDs does not put records into chronological order.
UUID output and formatting examples
3fa85f64-5717-4562-b3fc-2c963f66afa6. The first digit of the third group is 4, identifying version 4. Actual results will be different each time.3FA85F64-5717-4562-B3FC-2C963F66AFA6. Case changes presentation, not the identifier.3fa85f6457174562b3fc2c963f66afa6. This compact form has 32 hexadecimal characters; some systems require the standard 36-character form with hyphens.Formula / Calculation Method
How to Use This Tool
- Enter a whole-number quantity from 1 to 100.
- Choose the case and whether to include hyphens.
- Click Generate UUIDs, then Copy All for one identifier per line.
- Use the format required by your application and enforce uniqueness where records are stored.
Common Use Cases
Uniqueness has a practical limit
Random UUIDs have a very low collision probability, but there is no absolute guarantee. Keep a unique constraint in a database if duplicates must be rejected. Do not treat an identifier as proof that a user is authorized to access a record.
How these values are generated
The tool uses the browser crypto API, with a cryptographically random byte fallback where needed. If no secure random source is available, it shows an error rather than generating weak identifiers. Generation occurs locally; there is no central UUID registry or reservation. Each click creates a new batch and replaces the previous result.