UUID Generator
Generate a UUID (also known as a GUID) — v4 random, v7 sortable, v1 timestamp-based, or bulk up to 1000 at once. Generated locally in your browser.
v1 uses your device's clock plus a random, non-traceable node identifier — it does not use or reveal your real MAC address.
Bulk generate
UUID vs GUID — what's the difference?
None, functionally. A UUID (Universally Unique Identifier) and a GUID (Globally Unique Identifier) are the same 128-bit value format — UUID is the RFC 4122/9562 standard name, GUID is the term Microsoft uses for identical identifiers in .NET and Windows. Every ID this generator produces works as both.
Which version should I pick?
v4 is fully random and the right default for most use cases (database records, API keys, session tokens). v7 embeds a millisecond timestamp so IDs generated later always sort after earlier ones — useful as a database primary key where insert order matters for index performance. v1 also embeds a timestamp but uses an older 1980s-era layout; this generator substitutes a random node ID instead of your real network MAC address so it stays private.
Frequently asked questions
What's the difference between a UUID and a GUID?
They're the same thing. UUID (Universally Unique Identifier) is the standard name defined by RFC 4122/9562; GUID (Globally Unique Identifier) is Microsoft's name for the same 128-bit identifier format. Any UUID generated here works as a GUID.
Which UUID version should I use?
Use v4 for general-purpose random unique IDs (the most common choice). Use v7 if you need IDs that sort chronologically (better for database primary keys/indexes). Use v1 only if you specifically need a timestamp embedded and don't mind older tooling; this generator uses a random, non-traceable node ID instead of your real MAC address for privacy.
Can I generate many UUIDs at once?
Yes — set the quantity field to any number from 1 to 1000 and click Generate Bulk. You'll get a list you can copy or download as a .txt file.
Are the UUIDs generated on a server or stored anywhere?
No. All UUIDs are generated locally in your browser using the Web Crypto API. Nothing is transmitted to or stored by IT Cares.