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UUID Generator

Generate v4 UUIDs in bulk.

No upload

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Processing happens on your device using your browser's CPU/GPU. Results are kept only in this tab's memory and are wiped when you click “Clear” or close the page.

About UUID Generator

Generate version 4 UUIDs, the 128-bit random identifiers used as primary keys, request IDs and file names when a database counter will not do. Ask for one or ten thousand at a time and copy or download the lot. Each value comes from your browser's cryptographic random generator, so the IDs are created on your device and are never seen by us or stored anywhere.

How to use UUID Generator

  1. Set How many, from a single UUID up to 10000.
  2. Choose the formatting you need: Uppercase, Hyphens, or braces for Microsoft style GUIDs.
  3. Click Generate to produce a fresh batch.
  4. Copy the list or download it as uuids.txt.

What people use it for

  • Creating primary keys for rows you are inserting into a database by hand
  • Seeding test fixtures or mock API data with realistic unique identifiers
  • Naming uploaded files so two users cannot overwrite each other's upload
  • Generating correlation or request IDs for tracing a call across microservices

Good to know

These are version 4 UUIDs, meaning 122 random bits with the version and variant bits set as the standard requires. They are not sequential and carry no timestamp, so they do not sort in creation order and can fragment a clustered database index. Unhyphenated and braced forms describe the same value written differently.

Frequently asked questions

Can two generated UUIDs ever be the same?
In practice, no. With 122 random bits, the chance of a collision is so small that applications worldwide rely on it. Your browser's cryptographic random generator supplies the entropy.
What does version 4 mean?
It means the identifier is built from random data rather than from a timestamp or a MAC address. That makes it unpredictable and safe to expose in URLs.
Are the UUIDs generated on a server?
No. They are produced in your browser with crypto.randomUUID or getRandomValues, so the values never travel over the network and nothing is logged.
Should I use a UUID instead of an auto-increment ID?
Use one when IDs must be created offline, merged across systems, or kept unguessable in a URL. Auto-increment stays better for small single-database apps that need sortable keys.