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Instant, private, and free

UUID Generator.

Generate one or many RFC 4122 v4 UUIDs instantly

On-device calculationNo signup
01

Set your values

Results update as you type.

47013ba0-8c9f-4521-bdd6-49c2f9bbf2c2
bae72c97-d9f0-4a86-8b36-776312e1d577
ad1ce60c-5b2c-41ce-ae8d-068f24e54409
8ce06724-f8be-42b5-bb6a-65771bb77817
374eae68-736e-4dd1-8ac3-5743e73f4c91

How to Use the UUID Generator

Generate random universally unique identifiers (UUID v4) for databases, APIs, and keys.

  1. Choose how many UUIDs to generate.
  2. Click generate.
  3. Copy the UUIDs for use in your application.

UUID v4 Format

Structure

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

122 random bits; version 4 and variant bits are fixed.

Example:

Input: v4

Calculation: random hex

Result: e.g. 3f2504e0-4f89-41d3-9a0c-0305e82c3301

Real-World Use Cases

Database Keys

Use UUIDs as primary keys that don't collide across systems.

API Tokens

Generate unique request or session identifiers.

Tips

Tips

  • UUID v4 collisions are astronomically unlikely.
  • For ordered keys, consider UUID v7 or ULIDs instead.

Cite this calculator

Canonical URL: https://mathify.one/en/random/uuid

Cite as: Mathify. (2026). UUID Generator. https://mathify.one/en/random/uuid

Use Cases

Database Primary Keys

Use UUIDs as primary keys in databases to avoid collisions and enable distributed data generation without coordination.

Example: Generate a UUID for each new user record in a user table.

API Request Identifiers

Assign unique identifiers to API requests or responses for tracking and debugging purposes.

Example: Generate a UUID for each incoming request to log and trace.

Frequently Asked Questions

What is a UUID v4?
A UUID v4 is a universally unique identifier generated from random numbers. It follows the RFC 4122 standard and is used to uniquely identify information in computer systems without requiring a central registration authority.
How many UUIDs can I generate at once?
You can generate as many as you need by adjusting the 'count' field. The tool will output that many unique UUIDs, each generated independently to ensure uniqueness.
Are the generated UUIDs secure?
Yes, the UUIDs are generated using a cryptographically secure random number generator, ensuring that each UUID is unpredictable and suitable for security-sensitive applications.

Tips & Common Mistakes

Tips

  • Use a count of 1 for a single UUID, or increase it to generate multiple at once for batch testing.
  • Copy the generated UUIDs to your clipboard for immediate use in your code or database.
  • For testing, generate a batch of UUIDs and verify they are all unique before using them in your application.
  • Remember that UUID v4 is random, so there is a tiny chance of collision, but it is negligible for practical purposes.

Common Mistakes to Avoid

  • Assuming UUIDs are sequential or sortable by time – they are random and not ordered.
  • Using UUIDs as the only index in large databases without considering performance implications.
  • Forgetting to validate that the generated UUIDs are in the correct format (8-4-4-4-12) before using them.

Last updated: August 13, 2026