UUID Generator

What is a UUID v4?

A UUID (Universally Unique Identifier) is a 128-bit value designed to be globally unique. Version 4 UUIDs are generated using random numbers, making them ideal for identifiers that don't rely on a central authority, database sequence, or predictable pattern.

They are widely used for database primary keys, session IDs, resource identifiers in APIs, and anywhere you need a high probability of uniqueness across systems and environments.

How the UUID v4 Generator Works

1. When supported, the tool uses the browser's native crypto.randomUUID() API to generate a standards-compliant v4 UUID.
2. If that API isn't available, it falls back to a manual implementation that builds a xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx pattern with random hex digits.
3. The "4" in the third block indicates version 4, and the "y" nibble is set to one of 8-b to match the RFC 4122 variant bits.
4. For bulk generation, the tool repeats this process for the requested count (capped at 100) and lists each UUID on its own line.

How to Use this UUID v4 Generator

1. Enter how many UUIDs you want to generate (between 1 and 100).
2. Click the Generate button to create a fresh list of UUID v4 values.
3. Review the generated list in the output panel. Each UUID appears on its own line in standard string format.
4. Use Copy All to copy the entire list to your clipboard, or click Download to save them as a uuids.txt file.
5. Paste the UUIDs into your database seeder, config file, test fixtures, or code as needed.

Common Use Cases & Value

• Generating IDs for database records without relying on auto-increment or central coordination.
• Creating unique identifiers for API resources, URLs, or public-facing tokens.
• Seeding test data and fixtures in development and QA environments.
• Assigning unique tokens for background jobs, queues, or distributed tasks.
• Using as correlation IDs in logs and observability pipelines across microservices.

Privacy & Safety Disclaimer

All UUIDs are generated locally in your browser using JavaScript and are not sent to any server. This tool does not log, store, or share your generated identifiers. For highly sensitive production use, you may still prefer to generate UUIDs directly within your backend stack to keep all critical ID creation inside your controlled infrastructure.