UUID Generator
Generate random UUID v4 identifiers online for free, using your browser's cryptographically secure random number generator. Nothing sent to a server.
Your files are processed locally in your browser and are not uploaded to our servers.
How to use UUID Generator
- 1
Choose how many UUIDs to generate — 1, 5, 10, 50, or 100.
- 2
Click "Generate."
- 3
Copy or download the list.
Common uses
- Generating unique IDs for test data or database seed records
- Creating a placeholder ID while prototyping before a real ID system is wired up
- Generating a batch of unique identifiers for a script or config file
Supported formats and limitations
Accepts text, up to one file at a time.
- These are version 4 (random) UUIDs — not version 1 (time-based) or version 5 (namespace-based), which encode different information and aren't purely random.
- Up to 100 UUIDs per generation, comfortably more than most one-off needs.
Frequently asked questions
They're generated using the Web Crypto API (`crypto.randomUUID()`, or a manual fallback built on the same cryptographically secure `crypto.getRandomValues()`), never `Math.random()`.
Version 4 — randomly generated, the most common type for general-purpose unique identifiers.
No. Every UUID is generated entirely in your browser.
A fallback generates a valid v4 UUID by hand from the same secure random source, so the guarantee of unpredictability doesn't depend on that specific function existing.