UUID Generator
Generate UUID v4 (random) and other UUID versions. Generate single or bulk UUIDs with format options.
Version:
Randomly generated (recommended)
Format:
Count:
Frequently Asked Questions
What is a UUID?▾
A UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify information in computer systems. The standard format is 32 hexadecimal digits in five groups: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
What is the difference between UUID versions?▾
UUID v1 uses time and MAC address. UUID v4 is randomly generated (most common). UUID v5 uses a namespace and name with SHA-1 hash. UUID v7 is time-ordered for database performance.
Are generated UUIDs truly unique?▾
UUID v4 has 122 random bits, giving 2^122 possible values. The probability of collision is astronomically low — generating a billion UUIDs per second for 100 years would have a 50% chance of collision only once.