Generate GUIDs for your code, database or tests: random or time-ordered, one or a hundred, in the format you need.
The result will appear here
UUID v4 uses cryptographically secure random numbers. Best for general-purpose unique identifiers.
GUID (Globally Unique Identifier) is the name Microsoft uses, in .NET, Windows and SQL Server, for what the standard calls a UUID: a 128-bit identifier written as 32 hexadecimal digits in five groups (8-4-4-4-12). Any GUID made here is a valid UUID, and the reverse: you can paste it into a C# Guid, a SQL Server uniqueidentifier column, a PostgreSQL uuid column or a JSON document.
A v4 GUID is fully random: it is what Guid.NewGuid() in .NET and NEWID() in SQL Server give you. A v7 GUID starts with the time it was made, so new values sort after older ones: as a primary key it keeps database indexes compact, which random GUIDs don't (.NET 9 has Guid.CreateVersion7() for it).
The GUIDs are drawn with your browser's cryptographic random generator, never on our server, and nothing is stored. Generate up to 100 at once, in upper or lower case, with or without dashes, then copy them all in one click.
v4 for a random GUID, v7 for GUIDs that sort by creation time (database keys).
Upper or lower case, with or without dashes, from 1 to 100 GUIDs.
Copy one GUID or the whole list and paste it into your code, your SQL script or your test data.
For a table that grows a lot, prefer v7: rows inserted one after the other get neighbouring keys, so the index stays ordered and inserts stay fast.
Keep v4 when the identifier must not reveal when it was created, for example a public token in a URL.
TipGUIDs are generated on your device with the Web Crypto API, the same source browsers use for encryption keys.
Nothing is sent to us or kept: closing the page forgets them.
PrivacyGUIDs in short