UUID Generator -- v4 & v7
Generate UUID v4 (random) and v7 (timestamp) identifiers instantly. Free online UUID generator with bulk generation and copy support. Cryptographically secure.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hex digits in 5 groups (8-4-4-4-12). UUIDs are designed to be unique without a central authority. The most common versions are v4 (random) and v7 (timestamp-based).
What is the difference between UUID v4 and v7?
UUID v4 is entirely random, generated using cryptographic randomness. UUID v7 embeds a Unix timestamp in the first 48 bits, making UUIDs sortable by creation time while still being unique. V7 is preferred for database primary keys.
Are UUIDs truly unique?
For practical purposes, yes. UUID v4 has 122 random bits, giving 5.3 x 10^36 possible values. The probability of generating a duplicate is astronomically low — you would need to generate 2.71 quintillion UUIDs to have a 50% chance of one collision.
How many UUIDs can I generate at once?
This tool supports bulk generation of 1, 5, 10, or 50 UUIDs at once. All UUIDs are generated using crypto.getRandomValues() for cryptographic security. You can copy individual UUIDs or all of them at once.