GUID / UUID Generator
Generate cryptographically secure UUID v4 identifiers. Bulk-generate up to 20 at once, choose your format, and copy with one click. Runs entirely in your browser.
008665c7-639c-47e0-9e36-67f0541e3b20Format example: 550e8400-e29b-41d4-a716-446655440000 · All generation uses crypto.randomUUID() — cryptographically secure.
UUID vs GUID
UUID (Universally Unique Identifier) is the open standard (RFC 4122). GUID (Globally Unique Identifier) is Microsoft's implementation — functionally identical. The terms are interchangeable in practice.
UUID v4
Version 4 UUIDs are randomly generated using a cryptographically secure random number generator. With 2¹²² possible values, the probability of a collision is negligible even at massive scale.
When to use which format
Standard (hyphenated) is most portable. No-hyphens works well for database primary keys or URLs. Uppercase is common in .NET/C# environments. Braces format ({...}) is used in Windows Registry and COM.
