UUID v4
Random identifiers for records, resources and distributed systems.
Generated UUIDs
Your UUIDs will appear here.
Generate a batch, then copy individual values or export the list.
Export format
Copy all uses one UUID per line.
Values stay local during generation. Sharing sends a separate saved copy.
Generation runs in this browser. Sharing is a separate action.
Secure randomness
Generated using your browser’s Web Crypto API.
Batch workflow
Copy individual values or the full list.
What is a UUID?
A 128-bit identifier commonly used for records, resources and distributed systems. UUID v4 collisions are extremely unlikely, but not impossible.
Identifiers are not a replacement for an authentication design.
JSON export preview
UUID v4 uses random identifiers with an extremely low collision probability. Enforce uniqueness where your application requires it.
UUID Generator FAQ
How are these UUIDs generated?
Each value is created in this browser with crypto.randomUUID(). If that function is missing, the page uses crypto.getRandomValues() and sets the version 4 and RFC variant bits. Generation does not use a server.
Can I generate multiple values?
Yes. Enter a whole number from 1 to 20. The full batch is built before it is shown. Generate new batch replaces the current list.
Are collisions possible?
A UUID is a 128-bit identifier. Version 4 uses 122 random bits. A collision is extremely unlikely, but not impossible. Enforce a unique constraint where your application requires uniqueness.
What happens when I share a batch?
Sharing is separate from generation. Review share contents shows the count and the exact values. The link stores that batch for 24 hours and does not put the values in the URL. Opening it does not generate a new batch.