Part of the topic: 🔐 Online security
UUID / GUID generator
Create random version-4 UUIDs with the browser's cryptographic random generator. Generate one or a thousand, in the format you need.
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Choose how many UUIDs you need.
- Pick the format: uppercase, without hyphens or with braces.
- Copy them all with one click.
Last checked: October 2026. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
What is a UUID v4?
A 128-bit identifier with 122 random bits, written as 32 hex digits in five groups (8-4-4-4-12). The chance of two being identical is negligible.
Are UUID and GUID the same?
Yes – GUID is Microsoft's name for the same standard (RFC 9562, formerly RFC 4122).
Are they generated securely?
Yes, with crypto.randomUUID / crypto.getRandomValues in your browser.