- How do I use this GUID generator?
- Open the page and a fresh GUID/UUID is generated instantly in your browser, then copy it with one click. Refresh or click generate again to produce a new value whenever you need one.
- What is a GUID/UUID?
- A GUID (Globally Unique Identifier), also called a UUID, is a 128-bit value written as 32 hexadecimal digits in the pattern 8-4-4-4-12, such as 550e8400-e29b-41d4-a716-446655440000. It is designed to be unique across systems without a central authority assigning it.
- Why do developers use GUIDs?
- GUIDs let you assign unique IDs to database rows, files, sessions or messages without coordinating with other systems, avoiding collisions across servers and databases. They are handy as primary keys or correlation IDs in distributed applications.
- Which version does this tool generate and how do I read it?
- It produces random version 4 UUIDs: the 13th hex digit is always 4 (the version) and the 17th is 8, 9, a or b (the variant). Everything else is random, so you cannot derive a timestamp or machine from a v4 value.
- Are these GUIDs truly guaranteed to be unique?
- Version 4 GUIDs are not mathematically guaranteed unique, but with 122 random bits the chance of a collision is so small it is negligible in practice. Generation happens entirely in your browser and nothing you produce is sent to a server or stored.