UUID Generator
Batch generate UUID v4 identifiers.
How to Use the UUID Generator
- Set the count — Generate anywhere from 1 to 1,000 UUIDs in a single batch.
- Choose a format — Toggle Uppercase for capital hex letters, or No dashes for the compact 32-character form.
- Generate — Fresh UUID v4 identifiers appear instantly, one per line.
- Copy All — Send the whole batch to your clipboard, ready for your code, database seeds, or test fixtures.
What Is a UUID v4?
A UUID (Universally Unique Identifier) is a 128-bit value written as 36 characters: eight hex digits, three groups of four, then twelve, separated by dashes. Version 4 means the identifier is essentially random — 122 of its 128 bits are randomness, with the rest marking version and variant. That randomness is the point: two people on opposite sides of the planet can generate UUIDs without coordinating, and the chance of a collision is so small (about 1 in 2.7 quintillion per pair) that the industry treats it as zero.
Where UUIDs Beat Auto-Increment IDs
Use them wherever a central counter is awkward: distributed databases, offline-first apps, file names for user uploads, session identifiers, and test data. They also don't leak information — an auto-increment ID tells the world how many users you have; a UUID tells them nothing.
Frequently Asked Questions
Will two generated UUIDs ever collide?
Practically never. You'd need to generate about a billion UUIDs per second for 85 years to have a 50% chance of one collision.
Are these UUIDs cryptographically secure?
They're generated locally in your browser and are perfect for database keys, identifiers, and test data. For security tokens or secrets, use a generator backed by crypto.getRandomValues, like our password generator.
Why remove the dashes?
Some databases and systems store UUIDs as raw 32-hex-character strings. Both forms represent the same 128-bit value — use whichever your stack expects.