Click Generate for new UUID v4. Generate multiple at once. Copy individual or full list.
UUIDs everywhere in development. Generate instantly without coding.
UUID (standard term) and GUID (Microsoft name) identical.
122 random bits; collision astronomically unlikely.
Random version; most common.
Yes, 10, 50, 100+ at once.
Generate UUIDs (Universally Unique Identifiers) and GUIDs in version 1, 4, and 5 formats with the Toolzie UUID/GUID Generator. Generate in bulk, in uppercase or lowercase, with or without hyphens.
UUID v1 is based on the current timestamp and MAC address. UUID v4 is completely random. v4 is preferred for privacy and general use.
UUID v4 has 122 bits of randomness — the probability of collision is astronomically small, making them effectively unique in practice.
GUID (Globally Unique Identifier) is Microsoft's term for UUID. They are the same format and interchangeable.
Yes — UUIDs are commonly used as primary keys, especially in distributed systems where sequential integer IDs can conflict.