UUID Generator

What is a UUID / GUID?

A UUID (Universally Unique Identifier), also known in the Microsoft world as a GUID (Globally Unique Identifier), is a 128-bit label used to uniquely identify information in computer systems. A standard UUID looks like this: 123e4567-e89b-12d3-a456-426614174000.

Our free UUID Generator allows developers, database administrators, and testers to instantly generate thousands of valid, random Version 4 UUIDs directly in their browser. Because these are generated using a cryptographically strong random number generator, the chance of a collision (generating the same ID twice) is effectively zero.

How to Use the UUID Generator

1. 1
   Select the Quantity

   Enter how many UUIDs you need to generate. You can generate a single ID or up to thousands at once for bulk database seeding.

2. 2
   Choose the Format

   Select whether you want standard hyphens (e.g., 8-4-4-4-12), no hyphens, or uppercase letters.

3. 3
   Generate and Copy

   Click Generate. Your UUIDs will be generated instantly. Click Copy to grab them all.

Why Use UUIDs Instead of Auto-Increment IDs?

• ✓ Security: If your user profiles have an ID of '5', an attacker can easily guess that user '6' exists. UUIDs are impossible to guess.
• ✓ Distributed Systems: If you have multiple databases syncing with each other, generating a UUID ensures no two databases accidentally create the same ID for different records.
• ✓ Offline Data Creation: A mobile app can generate a UUID offline and save a record, then sync it to the cloud later without worrying about ID conflicts.