Question 1

What is a UUID?

Accepted Answer

A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. The probability of generating two identical UUIDs is negligibly small, making them ideal for database keys, session IDs, and distributed system identifiers.

Question 2

What is UUID v4?

Accepted Answer

UUID v4 is a randomly generated UUID. Unlike v1 (time-based) or v3/v5 (name-based), v4 uses random numbers for all bits except two version indicator bits. It is the most commonly used UUID version for general-purpose unique ID generation.

Question 3

Are the generated UUIDs truly unique?

Accepted Answer

Yes. This tool uses the browser's native crypto.randomUUID() function, which uses a cryptographically secure random number generator. The probability of collision is so astronomically low it is considered safe to treat these as globally unique.

Question 4

Can I use these UUIDs as database primary keys?

Accepted Answer

Yes. UUID v4 values are commonly used as primary keys in PostgreSQL, MySQL, MongoDB, and DynamoDB. They allow records to be created across distributed systems without coordination.

Question 5

Is there a limit on how many UUIDs I can generate?

Accepted Answer

This tool supports generating up to 100 UUIDs at once. For bulk generation beyond that, click Generate multiple times and download each batch as a text file.

UUID Generator

What is a UUID?

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