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UUID Generator

Generate secure random UUID v4 identifiers instantly for databases, APIs, application testing, and development. Create up to 100 UUIDs at once and copy them in one click.

FREE ONLINE TOOL

UUID Generator

Generate random UUID v4 identifiers securely in your browser.

UUID version 4 uses your browser’s cryptographically secure random generator. These IDs are not stored or transmitted.

How to generate UUIDs online

1. Choose how many UUIDs you need. Enter a number from 1 to 100 in the generator above.

2. Generate identifiers. Click Generate UUIDs to create a fresh set of random UUID version 4 identifiers.

3. Copy your results. Click Copy UUIDs to copy the generated values into your application, database, test fixtures, or API requests.

How UUID v4 identifiers work

UUID v4 is random. Each identifier is 128 bits long and typically displayed as 36 characters, including hyphens. Random UUIDs are designed to make accidental collisions extremely unlikely, but uniqueness is not mathematically guaranteed.

Use UUIDs as identifiers, not passwords. UUIDs can label records and requests, but should not replace access tokens, authentication secrets, or authorization checks. Generated UUIDs are not automatically checked against identifiers already present in your database.

Frequently asked questions

Common questions about UUID v4 generation, uniqueness, and practical uses.

A UUID version 4 is a 128-bit identifier generated mainly from random bits. It is commonly represented in a five-group hexadecimal format, such as xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx.
No. UUID v4 identifiers have an extremely low probability of collision when generated correctly, but uniqueness is not absolutely guaranteed. For databases, a unique constraint is still recommended.
This generator supports batches of 1 to 100 UUIDs. Enter the quantity, click Generate UUIDs, and use Copy UUIDs to copy the results.
Developers use UUIDs for database record identifiers, API request IDs, test data, event tracking, and identifiers in distributed applications.
The generator uses your browser’s cryptographically secure random generator to create UUIDs locally. The tool does not need to submit generated values to a server.

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