UUID / GUID Generator
Generate cryptographically secure Universally Unique Identifiers (UUID v4) individually or in bulk with full formatting control.
00000000-0000-0000-0000-000000000000
Generating UUIDs in Code
| Language / Platform | Standard Method |
|---|---|
| C# / .NET | Guid.NewGuid().ToString() |
| JavaScript (Modern Browser / Node.js) | crypto.randomUUID() |
| Python | import uuid; str(uuid.uuid4()) |
| SQL (PostgreSQL) | SELECT gen_random_uuid(); |
| Java | java.util.UUID.randomUUID().toString(); |
Frequently Asked Questions
A Universally Unique Identifier (UUID), also termed a Globally Unique Identifier (GUID) in Microsoft ecosystems, is a 128-bit number used to uniquely identify resources without central authority coordination.
UUID v4 contains 122 random bits, giving $2^{122}$ (or approximately $5.3 \times 10^{36}$) possible combinations. The probability of a collision is so infinitesimally small that it is practically impossible in real-world systems.