Are UUIDs truly unique?

UUID v4 generates 122 random bits, producing 5.3 undecillion possible values. The probability of a collision is so low that it is considered negligible for any practical application.

Should I use UUIDs or auto-incrementing IDs?

UUIDs are preferred for distributed systems where multiple services create records independently. Auto-incrementing IDs are simpler and more compact but require a central authority to avoid conflicts.

Can I generate UUIDs without dashes?

The tool generates standard format UUIDs with dashes. You can remove dashes from the output if your application requires the compact format.

How to Generate a UUID

3 min readDeveloper

UUIDs (Universally Unique Identifiers) are used as primary keys, session tokens, and unique references across databases and distributed systems. This guide shows you how to generate UUIDs for free using a browser tool.

Quick Steps

1
Open UUID Generator
Go to the UUID Generator on Toolin.
2
Select version
Choose UUID v4 or another version.
3
Set quantity
Enter how many UUIDs to generate.
4
Copy the UUIDs
Generate and copy from the output.

UUID Generator

Generate random UUIDs

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Step-by-Step: Generate UUIDs

Open the UUID Generator

Navigate to the UUID Generator on Toolin.

Select the UUID version

Choose UUID v4 (random) for most use cases, or select another version if your application requires it.

Set the quantity

Specify how many UUIDs you need. You can generate one or hundreds at once.

Generate and copy

Click Generate and copy the UUIDs to your clipboard. Each UUID is guaranteed to be unique.

Understanding UUID Versions

UUID v4 is the most commonly used version. It generates 122 random bits, making collisions astronomically unlikely. UUID v1 includes a timestamp and MAC address, which can leak information but guarantees uniqueness across machines. UUID v7 is a newer format that combines a timestamp with random bits, providing sortability while maintaining uniqueness. For most applications, v4 is the right choice.

Common UUID Use Cases

Primary keys for database records.
Unique identifiers for API resources.
Session tokens and request correlation IDs.
File names to avoid collisions in storage systems.
Idempotency keys for safe API retries.

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Frequently Asked Questions

Are UUIDs truly unique?: UUID v4 generates 122 random bits, producing 5.3 undecillion possible values. The probability of a collision is so low that it is considered negligible for any practical application.
Should I use UUIDs or auto-incrementing IDs?: UUIDs are preferred for distributed systems where multiple services create records independently. Auto-incrementing IDs are simpler and more compact but require a central authority to avoid conflicts.
Can I generate UUIDs without dashes?: The tool generates standard format UUIDs with dashes. You can remove dashes from the output if your application requires the compact format.