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UUID Generator

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Free online UUID v4 generator. Generate unique identifiers with customizable format options. Copy single or批量 UUIDs instantly.

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UUID v4

Quick answers for UUID Generator

What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit ID - typically shown as 36 characters with dashes - that is extremely unlikely to collide across systems, which makes it ideal for database keys, file names, and distributed IDs.
What version of UUID does this tool generate?
The UUID Generator produces v4 UUIDs - random - using the browser's native crypto.randomUUID() function. That matches the recommendation in RFC 4122 for most application-level IDs.
Can I get the UUID without hyphens or in uppercase?
Yes. Toggle the hyphens off to get a 32-character compact form, and toggle UPPER to switch the hex digits to uppercase. The output updates in place.
Are these UUIDs cryptographically secure?
The UUID Generator uses crypto.randomUUID(), which is backed by the platform CSPRNG. That said, UUIDs are identifiers - use them for IDs, not for secrets.
Does the UUID Generator work offline?
Yes. Once the page is loaded, the generator runs entirely in your browser with no network calls.