UUID / GUID Generator
Generate random version 4 UUIDs and GUIDs individually or in bulk with custom casing, hyphens, and client-side browser processing.
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How to Use the UUID / GUID Generator
Choose how many UUID or GUID identifiers you need (1 to 100), configure uppercase/lowercase formatting and hyphens, then click "Generate UUIDs". All identifiers are generated locally in your browser using the native Web Crypto API with zero network transmission.
Formula & Calculation Method
RFC 4122 / RFC 9562 Version 4 UUID / GUID: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx (where y is 8, 9, a, or b)A standard version 4 UUID provides 122 randomly generated bits according to RFC specifications, making unintentional collisions practically negligible in typical applications.
Calculation Examples
Standard Lowercase with Hyphens
Uppercase without Hyphens
Frequently Asked Questions
What is the difference between a UUID and a GUID?
GUID is a commonly used term for a 128-bit identifier, while UUID is the standardized terminology defined by IETF specifications (such as RFC 4122 / RFC 9562). In many software environments, the terms are used interchangeably to refer to equivalent identifier formats.
Is this online UUID / GUID generator cryptographically secure?
The generator uses the browser’s native cryptographic random number facilities (such as crypto.randomUUID() and crypto.getRandomValues()) to generate UUID v4 identifiers directly on your device, without server-side processing.
Can I generate multiple GUIDs or UUIDs at once?
Yes. You can generate between 1 and 100 UUID/GUID identifiers at a time, toggle hyphens or uppercase formatting, and copy them all or download them as a .txt file.