UUID Calculator

Generate UUIDs (Universally Unique Identifiers) in multiple versions instantly with this free online calculator

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About This Tool

The UUID Calculator is a powerful online tool that generates Universally Unique Identifiers (UUIDs) in multiple versions including v1 (timestamp-based), v3/v5 (namespace-based), v4 (random), and v7 (timestamp-based with random). This tool allows you to specify the number of UUIDs needed, customize generation options, and instantly create unique identifiers for databases, distributed systems, APIs, and applications. All generation happens client-side in your browser for maximum privacy and speed.

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How to Use

Select the UUID version (v1, v3, v4, v5, or v
from the dropdown menu
Enter the number of UUIDs you need (1-
For v3/v5 UUIDs, enter a namespace UUID and a name
For v1 UUIDs, optionally specify a custom timestamp
Click 'Generate UUIDs' to create your unique identifiers
Copy individual UUIDs or download all as a text file

Frequently Asked Questions

Find Quick Answers

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are standardized by RFC 4122 and appear as 32 hexadecimal digits displayed in five groups separated by hyphens (e.g., 123e4567-e89b-12d3-a456-426614174000).

What are the different UUID versions?

Version 1: Time-based with MAC address Version 3: MD5 hash of a namespace and name Version 4: Random or pseudo-random Version 5: SHA-1 hash of a namespace and name Version 7: Time-based with random data (newer standard)

How many UUIDs can I generate at once?

You can generate between 1 and 1000 UUIDs in a single operation. For larger batches, simply run the tool multiple times.

Are the generated UUIDs truly unique?

While UUIDs are designed to be unique, the probability of duplicates varies by version. Version 4 (random) UUIDs have a 1 in 2^122 chance of collision. For most practical purposes, they can be considered unique.

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