UUID / GUID Generator

Generate one or many secure random version 4 UUIDs instantly, in standard lowercase, uppercase, or Microsoft-style {…} GUID format. Ideal for database keys, request IDs, and any unique identifier. Uses your browser's cryptographically secure random number generator.

All computations run locally in your browser, no data uploaded to server.

Number

Output format

Output

How To Use

Choose how many UUIDs you need (1–100).
Pick an output format (lowercase, uppercase, braced GUID, or no dashes).
Click Generate to create them.
Click Copy all to copy every identifier to your clipboard.

Usage Example

Generating 2 UUIDs in braced GUID format:

{A2F7349C-3B8E-4F1A-9C2D-5F6E7A8B9C0D}
{B81D5E2A-7F6C-4A0E-93B5-1C2D3E4F5A6B}

Each identifier is a 128-bit value displayed in the standard 8-4-4-4-12 layout. A GUID (Globally Unique Identifier) is simply a UUID rendered with uppercase hex and optional surrounding braces — the two are interchangeable.

Frequently Asked Questions

Are these cryptographically secure?

Yes. The tool uses crypto.randomUUID(), backed by the browser's secure random-number source.

What is the difference between a UUID and a GUID?

They are the same thing. GUID is Microsoft's name for a UUID. The only differences are cosmetic: GUIDs are usually written in uppercase and may be wrapped in braces (for example {3F2E5A1C-…}). This tool's Upper and Braced GUID formats produce exactly those styles.

What UUID version is generated?

Version 4 (v4) — random-based, per RFC 4122.

Is anything uploaded?

No. UUIDs and GUIDs are generated entirely in your browser. Nothing is sent to a server.