A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems, typically formatted as a 32-character hexadecimal string.

Bulk UUID & GUID Generator (v4)

Generate cryptographically secure, random version 4 UUIDs and GUIDs instantly in bulk. 100% local processing - no data ever leaves your browser.

Number of UUIDs (1 - 1000)

Uppercase (e.g. 5B3C...) Remove Hyphens

Generated UUIDs (v4) Showing 10 UUIDs

How to use this tool

Select Quantity: Enter the number of UUIDs you want to generate in bulk (between 1 and 1,000). By default, 10 UUIDs are generated instantly.
Customize Formatting: Toggle uppercase lettering or remove hyphens according to your database or application syntax requirements.
Copy or Download: Click Copy to Clipboard to paste directly into your code, or click Download .txt to export your UUIDs as a clean plain text file.

How a Bulk UUID Generator Works Securely

Premise: Generating Version 4 UUIDs (Universally Unique Identifiers) or GUIDs for database seeding, API testing, or user token assignment is extremely common, but doing it on third-party servers poses a critical data exfiltration risk.

Evidence: Our online generator utilizes the Web Cryptography API (crypto.randomUUID()) to generate mathematically secure pseudo-random sequences entirely inside your browser's local memory. When generating in bulk (e.g., 1,000 at a time), or when applying formatting filters like removing hyphens or enforcing uppercase syntax, no server round-trips occur.

Conclusion: This client-side processing architecture guarantees that your generated IDs are never logged in an external database, making it 100% secure for enterprise applications and zero-trust environments.

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit label used to identify information across computer systems without requiring central coordination. It is typically represented as a 32-character hexadecimal string separated by hyphens (e.g., 123e4567-e89b-12d3-a456-426614174000).

What is the difference between a UUID and a GUID?

In practice, there is no difference. GUID (Globally Unique Identifier) is simply the term coined and favored by Microsoft in their ecosystem (.NET, Windows). UUID is the broader standard defined by the IETF (RFC 4122) and is used universally by developers across other platforms like Linux, Java, and Python.

Which UUID version should I use?

It depends on your use case:

UUID v4 (Recommended): Generated completely at random. This is the industry standard for generic identifiers, API tokens, and session keys. (Our bulk UUID generator produces v4).
UUID v7: Incorporates a time-ordered sequence. It is heavily recommended for database primary keys because chronological sorting avoids database index fragmentation.
UUID v1: Based on the server's MAC address and timestamp. Rarely used today due to privacy concerns.

Are UUIDs guaranteed to be unique?

They are not mathematically guaranteed, but the probability of a duplicate (a collision) is so phenomenally low that it is considered negligible. There are 2¹²² possible version 4 UUIDs. You would need to generate 1 billion UUIDs every second for about 85 years to reach even a 50% chance of a single collision.

How do I generate UUIDs in bulk?

Our free tool allows you to instantly generate up to 1,000 UUIDs at once. Simply enter your desired quantity in the 'Amount' field and click 'Generate'. The IDs are created instantly in your browser without any server communication.

Ultimate UUID Developer Hub

Everything you need to know about implementing, generating, and scaling UUIDs in modern software architecture.