UUID vs GUID: what’s the difference?
In everyday development, UUID and GUID usually mean the same thing: a 128-bit unique identifier. “GUID” is the name Microsoft popularized, while “UUID” is the more general standard term. This page works as both a UUID generator and GUID generator.
UUID v4 generator (random UUID)
UUID v4 is the default “normal” UUID most people use. It’s random and great for database IDs, request IDs, and unique tokens.
UUID v5 generator (name-based UUID)
UUID v5 is name-based and deterministic. You provide a namespace and a name (like a domain, URL, or username), and you always get the same UUID back for the same inputs. This is useful for stable IDs derived from existing strings.
UUID v7 generator (time-ordered UUID)
UUID v7 is time-ordered (it includes a timestamp component) which can be better for sorting and some database indexing patterns. It still includes randomness, but values are generally ordered by time.
Related tools
Developers often use UUIDs together with URL decode/encode and Base64 decode/encode. If you work with API payloads, you may also like JSON Formatter.