Free tool

UUID generator

Generate cryptographically random v4 UUIDs in bulk. Uses the native crypto.randomUUID() API. Supports uppercase, no-dash formats.

Count

UppercaseNo dashes

5 UUIDs

uuids

2534393c-8eb4-45eb-ad9d-08c97070b8a3

f720f729-e68a-4737-ab08-b1ffe5ccb889

f98028da-d2b7-480d-b786-12bc28347160

d37204b1-51e1-466b-a16f-37ce3c92417b

21e0a08e-12a7-4b05-b8d8-bf9d9012b3fb

What is UUID Generator?

A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122 that is guaranteed to be unique across space and time. Version 4 UUIDs are generated using cryptographically secure random numbers, making them ideal for database primary keys, session tokens, API request IDs, distributed system identifiers, and file naming. Our free UUID generator uses the browser's native crypto.randomUUID() API to produce truly random v4 UUIDs without any server-side processing. You can generate up to 100 UUIDs at once, format them in uppercase or without dashes for compatibility with different systems, and copy individual or all UUIDs with a single click. Whether you are building microservices, designing database schemas, or need unique identifiers for testing, this tool provides instant, cryptographically random UUIDs directly in your browser.

How to Use UUID Generator

1
Set your count and format
Choose how many UUIDs to generate (1-100) and toggle uppercase or no-dash formatting to match your system requirements.
2
Generate UUIDs
Click the Generate button to create a fresh batch of cryptographically random v4 UUIDs instantly in your browser.
3
Copy and use
Click any individual UUID to copy it, or use the Copy All button to grab the entire batch for pasting into your code, database, or configuration files.

Features

Cryptographically secure v4 UUIDs using crypto.randomUUID()
Bulk generation of up to 100 UUIDs at once
Uppercase formatting for systems requiring capital hex characters
No-dash format for compact storage and URL-safe identifiers
One-click copy for individual UUIDs or the entire batch
Runs entirely in your browser with zero server requests

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Frequently Asked Questions

Are these UUIDs truly random and unique?+

Yes. This tool uses the Web Crypto API (crypto.randomUUID()) which provides cryptographically secure random number generation. The probability of generating a duplicate v4 UUID is approximately 1 in 2^122, making collisions virtually impossible.

What is the difference between UUID v1 and v4?+

UUID v1 uses the current timestamp and MAC address to generate identifiers, which can expose device information. UUID v4 uses purely random data, providing better privacy and no dependency on hardware. This tool generates v4 UUIDs exclusively.

Can I use these UUIDs as database primary keys?+

Absolutely. UUID v4 is widely used as primary keys in PostgreSQL (uuid type), MySQL (CHAR(36) or BINARY(16)), MongoDB, and other databases. The no-dash format is useful when storing UUIDs as compact 32-character strings.

Why would I need uppercase UUIDs?+

Some systems and APIs require uppercase hex characters in UUIDs. For example, certain Microsoft APIs, SAP systems, and legacy databases expect uppercase format. The uppercase toggle ensures compatibility without manual conversion.

Is my data sent to any server?+

No. UUID generation happens entirely in your browser using the native Web Crypto API. No data is transmitted to any server, making this tool completely private and safe for generating sensitive identifiers.

How many UUIDs can I generate at once?+

You can generate up to 100 UUIDs in a single batch. For larger quantities, simply click Generate multiple times. Each batch is independently random and there is no limit on total generations per session.

What is UUID Generator?

How to Use UUID Generator

Set your count and format

Choose how many UUIDs to generate (1-100) and toggle uppercase or no-dash formatting to match your system requirements.

Generate UUIDs

Click the Generate button to create a fresh batch of cryptographically random v4 UUIDs instantly in your browser.

Copy and use

Click any individual UUID to copy it, or use the Copy All button to grab the entire batch for pasting into your code, database, or configuration files.

Features

Cryptographically secure v4 UUIDs using crypto.randomUUID()

Bulk generation of up to 100 UUIDs at once

Uppercase formatting for systems requiring capital hex characters

No-dash format for compact storage and URL-safe identifiers

One-click copy for individual UUIDs or the entire batch

Runs entirely in your browser with zero server requests

Frequently Asked Questions

Are these UUIDs truly random and unique?+

What is the difference between UUID v1 and v4?+

Can I use these UUIDs as database primary keys?+

Why would I need uppercase UUIDs?+

Is my data sent to any server?+

How many UUIDs can I generate at once?+