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UUID Generator

Developer

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

A UUID v1 embeds an actual timestamp and the generating machine's MAC address right inside the identifier, which makes it sortable by creation time but also leaks real information about when and where it was created, while a v4 UUID is built from 122 bits of pure randomness instead, carrying no timestamp, no machine identifier, nothing to infer beyond the identifier itself being effectively unique. This tool generates random v4 UUIDs, the safest default choice specifically when sortability isn't needed and avoiding any embedded information about origin actually matters.

See more about the UUID Generator

Useful for generating a database identifier that reveals nothing about when or where it was created, creating unique IDs for a system where sortable ordering isn't a requirement, or generating a batch of identifiers guaranteed not to leak timestamp or machine information the way a v1 UUID would.

Key features

  • Clean interface
  • Fast processing
  • No signup required
  • Works offline

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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.