UUID Generator
Generate UUID v4 (random) and other UUID versions. Generate single or bulk UUIDs with format options.
About this tool
Generate UUID v4 identifiers instantly for databases, APIs, and client-side IDs. Create one or many UUIDs and copy them in a click.
Example use case: Generate bulk UUIDs to seed test records or assign IDs in a migration script.
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.