Features

This UUID generator creates version 4 (random) UUIDs — also called GUIDs — instantly in your browser. Generate one or many at once, with or without hyphens, and in upper or lower case. UUIDs are 128-bit identifiers used as database keys, request IDs and unique references where a central counter isn't practical. Generation happens locally, so the values are produced on your device and not fetched from a server.

When You Need This

Common pain points this tool solves

1. Batch-generate UUIDs to seed database primary keys during development.
2. Create unique identifiers for test data or fixtures.
3. Produce an idempotency key or request ID for an API call.

How to Use

Step-by-step instructions

1. Choose the version (v4 random is the common default).
2. Set how many UUIDs you need.
3. Pick the format: with or without hyphens, upper or lower case.
4. Generate and copy them in bulk.

Why Choose Korelyy

What makes us better

1. Generates in bulk, not one at a time.
2. Flexible formatting: hyphens and letter case options.
3. Produced locally in your browser — nothing is requested from a server.

Monetize With This Tool

Turn this tool into a side income stream

1. Use this tool to speed up your freelance work and take on more paying clients
2. Create polished content faster for your blog, YouTube channel, or social media and grow your audience
3. Offer this tool's capabilities as a service on Fiverr, Upwork, or to your local business clients

Frequently Asked Questions

1. Is UUID Generator free to use?

   Yes. UUID Generator is 100% free for core features — no signup, no watermarks, no hidden paywalls on the tools you need day to day.

2. Do I need to sign up to use UUID Generator?

   No. Open and use instantly in your browser. Nothing to install, no account required. Your preferences stay on your device.

3. Is my data safe with UUID Generator?

   Yes. UUID Generator runs locally in your browser whenever technically possible — sensitive inputs are processed on your device, not on our servers. No tracking cookies.

4. Which devices does UUID Generator work on?

   Phones, tablets and desktops with any modern browser (Chrome, Safari, Edge, Firefox). Touch-friendly and responsive from 320px to 4K.

5. What UUID versions are supported?

   We support UUID v4 (fully random) and UUID v7 (time-sortable), the most commonly used versions in modern applications and databases.

6. Are generated UUIDs truly unique?

   Yes, UUID v4 uses 122 bits of randomness, making accidental collisions practically impossible even when generating millions of IDs.

7. Can I generate bulk UUIDs at once?

   Yes, you can generate up to thousands of UUIDs in a single click and copy them as a newline-separated list.