Toolkeel

UUID generator

Create unique IDs for databases, test data and configuration, in bulk, using your browser's cryptographically secure random number generator.

  • Free
  • Private
  • No sign-up
Version
UUID version
Stays on this device. Network requests since you started: 0 How to check this yourself
  1. Your text and dataRead from your device
  2. Worked on in this tabBy code running in your browser
  3. Ready to copyNothing is stored

Never sent to a server. See how to check

How to use it

  1. Choose v4 or v7 and how many you need.

  2. Adjust the format (uppercase, hyphens, braces).

  3. Copy or download the list.

About this tool

Version 4 UUIDs contain 122 random bits; the chance of two ever colliding is negligible. Version 7 (standardised in RFC 9562) starts with a millisecond timestamp, so new IDs sort after older ones. That keeps database indexes compact and is the better choice for primary keys in most new systems. Microsoft calls UUIDs GUIDs; the format is the same.

Good to know

  • Up to 1,000 per batch.
  • v7 UUIDs reveal roughly when they were created.

Frequently asked questions

Should I use UUID v4 or v7?

Use v7 for database keys (time-ordered, index-friendly) and v4 when the ID should reveal nothing about creation time.

Are these UUIDs truly unique?

They are generated with crypto.getRandomValues, a cryptographically secure source, so duplicates are practically impossible.

What is the difference between a UUID and a GUID?

None in practice. GUID is Microsoft's name for the same 128-bit identifier.

You might also need

Last updated 2026-10-20 by the Toolkeel team. How we build and check our tools.