Last Updated: January 28, 2026

● Developer Utility v2.6

Bulk UUID Generator
(v1, v4, & v7)

Our free Bulk UUID Generator is the fastest way to create secure unique identifiers directly in your browser. Whether you need standard random keys or the new time-ordered standards for database efficiency, this tool handles it instantly. Furthermore, it integrates seamlessly with our other free productivity tools to streamline your development workflow.

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Why Use This Bulk UUID Generator?

A Bulk UUID Generator is a critical utility for backend developers, database administrators, and QA engineers who need to produce large sets of "Universally Unique Identifiers" (UUIDs) simultaneously. Whether you are seeding a mock database for stress testing, assigning session tokens, or generating API keys, doing this manually is inefficient. Consequently, using an automated tool saves time. Unlike legacy tools that send your data to a server, our generator runs 100% client-side via the browser's Crypto API, ensuring maximum security and zero latency.

Deep Dive: How the Bulk UUID Generator Works

Generating a unique ID seems simple on the surface. However, the underlying mathematics are complex. Choosing the correct version is essential for ensuring your system's performance and long-term reliability.

The global standard for these identifiers is defined by IETF RFC 4122 and the newer RFC 9562 draft. These documents specify exactly how the 128-bit numbers should be constructed to guarantee uniqueness across space and time. Therefore, our tool strictly adheres to these protocols, using byte-level manipulation to ensure every ID you generate is valid for production use.

UUID Version 4 (Random)

This is widely considered the industry standard for most general applications. Version 4 IDs are generated using cryptographically secure pseudo-random numbers (CSPRNG) and provide 122 bits of entropy.

Because they are completely random, they have no inherent order. As a result, they are excellent for primary keys where you want to prevent users from guessing the "next" ID (a common vulnerability with auto-incrementing integers). Furthermore, the probability of a collision is statistically negligible. To put it in perspective, you would need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of a single collision.

UUID Version 7 (Time-Ordered)

In contrast to the randomness of v4, Version 7 is a cutting-edge standard designed specifically to solve "database index fragmentation."

Traditional v4 UUIDs are random, which causes database engines (like PostgreSQL, MySQL, and SQL Server) to constantly re-balance their B-Tree indexes. Consequently, this leads to slower write speeds ("INSERT" performance) and increased disk usage (I/O) as the table grows.

Version 7 solves this by combining a high-precision Unix Timestamp (48 bits) with random data. Therefore, the IDs are "monotonically increasing," meaning they sort naturally by time. As a result, databases can write these values significantly faster—often achieving performance comparable to standard auto-increment integers—while still maintaining the global uniqueness of a UUID.

UUID Version 1 (Gregorian Timestamp)

Version 1 is the original standard. It generates an ID based on the current time relative to the Gregorian Epoch (October 15, 1582) and the generating node's MAC address. However, in modern browser environments, accessing the physical MAC address is restricted for privacy reasons; therefore, we substitute it with a high-entropy random node ID while maintaining the correct 100-nanosecond timestamp logic.

Bulk UUID Generator Implementation Guide

Once you have generated your UUIDs using our tool, implementing them in your codebase is straightforward. For instance, here are examples for common languages:

Python (Standard Library)
import uuid# Generate a random UUID (v4) id = uuid.uuid4() print(id)
JavaScript (Node.js / Browser)
// Modern browsers & Node.js 14+ const id = crypto.randomUUID(); console.log(id);
SQL (PostgreSQL)
-- Create a table with UUID primary key CREATE TABLE users ( id UUID PRIMARY KEY DEFAULT gen_random_uuid(), username TEXT, created_at TIMESTAMP DEFAULT NOW() );

Related Developer Tools

If you found this Bulk UUID Generator useful, you might also benefit from our other productivity utilities designed to streamline your daily workflow. In addition, you can explore our complete library:

Frequently Asked Questions

Is there a risk of collision with this Bulk UUID Generator?
For Version 4, the risk is theoretically possible but statistically impossible. You would need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of a single collision. Therefore, it is safe for production use.
Can I use UUID v7 in MySQL or Postgres?
Yes. UUID v7 is binary-compatible with existing 128-bit UUID columns. You can store them as standard UUID types (Postgres) or CHAR(36) strings (MySQL) without any schema changes. Furthermore, using v7 often improves query performance due to its time-ordered nature.
Why is client-side generation safer?
Server-side generators require sending data over the network, which introduces latency and potential interception risks. In contrast, by generating keys in your browser, the data never leaves your machine. This makes it safe for generating internal API keys or sensitive session tokens.
Disclaimer: This tool generates Universally Unique Identifiers (UUIDs) locally within your browser using the `crypto.getRandomValues()` API. No data is transmitted to or stored on our servers. While these identifiers adhere to RFC 4122 standards, users are responsible for verifying suitability for production environments, particularly regarding collision probability in mission-critical distributed systems.

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