Free online UUID / GUID generator
Generate random version-4 UUIDs (GUIDs), one or in bulk, instantly in your browser.
- Runs in your browser
- Nothing uploaded
- Works offline
- No sign-up
About this tool
Generate cryptographically random version-4 UUIDs (also called GUIDs) for use as database keys, API tokens, file names, or test data. Choose how many you need, optionally strip the hyphens or switch to uppercase, and copy them all at once. Nothing is sent to a server - the random values come from the browser Web Crypto API, the same source used for encryption keys.
How to use it
- Set how many UUIDs you need (up to 100 at once).
- Toggle uppercase or "no hyphens" if your use case needs a different format.
- Click Generate, then Copy all to paste them wherever you need.
Frequently asked questions
What is a UUID?
A Universally Unique Identifier: a 128-bit value, usually written as 32 hex digits in five groups (8-4-4-4-12), designed so two independently generated UUIDs are extremely unlikely to ever collide.
Is UUID the same as GUID?
Yes for practical purposes. GUID (Globally Unique Identifier) is the Microsoft name for the same format defined by the UUID standard.
What version does this generate?
Version 4 (random), the most common type and the right default for database keys, tokens and test data. It uses the browser cryptographically secure random number generator.