UUID Generator
Generate random UUID v4 identifiers in bulk.
🔒 100% browser-based — your data never leaves your device.
About this tool
Generate RFC 4122 version 4 UUIDs — the random 128-bit identifiers used everywhere in software: database keys, API request IDs, file names, session tokens and more. Set how many you need, generate, and copy the whole list at once.
UUIDs are produced with the browser’s native crypto.randomUUID(), which uses a cryptographically secure random source.
Frequently asked questions
What is a UUID v4?
A 128-bit identifier written as 36 characters (8-4-4-4-12 hex digits) where 122 bits are random. Version 4 means it is generated purely from random numbers.
Can two UUIDs collide?
The probability is astronomically small: you would need to generate about 2.7×10¹⁸ UUIDs to reach even a 50% chance of one collision.
Are these UUIDs predictable?
No. They come from crypto.randomUUID(), which is backed by a cryptographically secure random number generator in your browser.