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UUID generator

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

Count
uuids
4f03b7d7-ae12-44e5-9271-cd6d5719d194
94cfd29c-c794-4a10-88cb-cc27ec4fa6bb
d6bd3c16-da4a-46a9-9086-1614402f356e
f6429435-3c68-4dbc-843f-abe4dea72050
4dde650e-bd4d-4bc4-b627-fd68c2a3f485

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. 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. 2

    Generate UUIDs

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

  3. 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.