Generate version 4 or version 7 UUIDs, also called GUIDs, one at a time or up to 1,000 at once. They are created in your browser with its secure random number generator.

How It Works

1. Pick a Version: Version 4 is fully random. Version 7 starts with the current time.
2. Choose How Many: Generate one, or up to 1,000 at once.
3. Set the Format: Choose uppercase or lowercase, with or without hyphens, and with or without braces.
4. Copy or Download: Copy the list, or download it as a text file with one UUID per line.

Key Features

• Secure Randomness: Uses the browser's cryptographic random number generator.
• Version 7: Time-ordered UUIDs that sort by creation time, which keeps database indexes efficient.
• Formats for Any System: Braces and uppercase suit Microsoft tools, and no hyphens suits compact storage.

Frequently Asked Questions

What is the difference between a UUID and a GUID?

They are the same thing. GUID is the name Microsoft uses for a UUID. Both are 128-bit identifiers written as 32 hexadecimal digits.

Should I use version 4 or version 7?

Use version 7 for database keys. Because it starts with a timestamp, new values sort after older ones, which keeps indexes compact and fast. Use version 4 when an identifier should reveal nothing, including when it was made.

Can two UUIDs ever be the same?

In practice, no. A version 4 UUID has 122 random bits, so you would need to generate billions of them every second for many years before a duplicate became likely.

Are these UUIDs saved anywhere?

No. They are created in your browser and are not sent to or stored on any server.