❓ Frequently Asked Questions
What is a UUID v4?+
UUID v4 (Universally Unique Identifier version 4) is a randomly generated 128-bit identifier. It is guaranteed to be unique across systems and is widely used in databases, APIs, and distributed systems to identify records without a central counter.
Are these UUIDs truly unique?+
Yes. UUID v4 uses cryptographically secure random values (via the browser's built-in crypto.getRandomValues API), making the chance of a collision astronomically small — roughly 1 in 5.3 × 10³⁶.
Can I use these UUIDs in production?+
Yes. The UUIDs are generated using the Web Crypto API which is the same standard used in production UUID libraries. They are safe to use as database primary keys, session IDs, or any unique identifier.
What is the no-hyphens format for?+
Some databases and systems prefer UUIDs without hyphens (e.g. MySQL BINARY(16) storage or certain API formats). The no-hyphens option removes the 4 dashes to give you a plain 32-character hex string.
Is there a usage limit?+
No limits at all. Generate up to 100 UUIDs per click, as many times as you need. Everything runs in your browser — free forever.