UUID Generator - Free Online IT Tool

🆔 UUID Generator

Generate unique v1 or v4 UUIDs for identifiers.

ℹ️ About UUID Generator

The UUID Generator creates Universally Unique Identifiers, which are 128-bit numbers used to identify information in computer systems without significant central coordination. Because of their massive number of possible values, the probability of generating the same UUID twice is effectively zero.

This tool supports the two most common types: Version 4 (Random), which is the modern standard for general purpose identifiers, and Version 1 (Time-based), which incorporates the current time and a unique node ID. UUIDs are essential for database primary keys, session identifiers, and any scenario where you need a unique name that won't conflict across different systems.

📖 How to use UUID Generator

1. Select the UUID version you need (v4 is recommended for most uses).
2. Click 'Run Tool' to generate a unique ID.
3. Copy the resulting 36-character string for use in your application or database.

❓ Frequently Asked Questions

What is the format of a UUID?

A UUID is represented as 32 hexadecimal digits, displayed in five groups separated by hyphens (8-4-4-4-12) for a total of 36 characters.

Is v4 truly unique?

While theoretically possible to have a collision, the number of v4 UUIDs is so large (2^122) that it is practically impossible to generate a duplicate in any realistic scenario.

When should I use Version 1?

Use v1 if you need identifiers that are sortable by time or if you need to guarantee uniqueness across different machines by using their hardware addresses.