How to use
- Choose quantity.
- Click generate.
- Copy.
FAQ
Will UUIDs collide?
v4 uses 122 random bits, so collisions are negligibly improbable — safe to use as a unique identifier in practice.
Does it need internet?
No. It uses the browser's crypto.randomUUID() locally, works offline, and uploads nothing.
What is the difference between v4 and v1?
v4 is fully random; v1 embeds a timestamp and MAC address, which can leak device info. v4 is recommended for most uses.
UUID or auto-increment ID?
UUID suits distributed systems and merged data sources (no conflicts); auto-increment is smaller and sortable for a single table.
Does the long UUID hurt DB performance?
36 chars are larger than integers and index slightly slower; if it matters, consider ULID or short IDs, but local UUID is the simplest.
Can I use a UUID directly as an order number?
You can, but external order numbers often add a prefix/timestamp for tracing; UUID is great for internal IDs, with a formatted layer for display.
About this UUID Generator
Uses crypto.randomUUID() (cryptographic). Generated locally.