UUID / GUID Generator
Generate cryptographically random UUID v4 codes (or GUID) instantly. Single or bulk generation. Copy to clipboard in one click.
Frequently Asked Questions
UUID is the open standard; GUID is Microsoft's implementation. They are functionally identical — both 128-bit identifiers in 8-4-4-4-12 hex format.
Practically yes. UUID v4 uses cryptographic randomness. The collision probability is roughly 1 in 5.3 × 10³⁶, making duplicates astronomically unlikely.
Select 'No Hyphens' from the Format dropdown and click Generate. You'll get a compact 32-character hexadecimal string.
Yes. Set the Quantity dropdown to 5, 10, 25, or 50 and click Generate. All UUIDs appear in the Bulk Output box, one per line, ready to copy.
What is a UUID?
A UUID (Universally Unique Identifier), also called GUID (Globally Unique Identifier), is a 128-bit label used to uniquely identify information in computer systems. The standard format is 8-4-4-4-12 hexadecimal digits, separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
UUID v4 (Random)
Version 4 UUIDs are generated using cryptographically random numbers. The probability of two UUIDs colliding is astronomically small — roughly 1 in 5.3 × 10³⁶. This makes them safe to use as unique identifiers without any central coordination.
Common Use Cases
- Database primary keys
- Session tokens and API keys
- File and resource identifiers
- Distributed systems and microservices