UUID Generator / GUID Generator
Generate cryptographically random UUIDs and GUIDs instantly, right in your browser. Supports v1, v4, v7 and nil UUID, bulk generation, and custom formatting - no sign-up, no ads, nothing sent to a server.
Bulk generate
UUID/GUID generators by language
Code examples for generating UUIDs in the language or database you're already working in.
Frequently asked questions
What is the difference between a UUID and a GUID?
UUID (Universally Unique Identifier) is the name defined by the RFC 4122 / RFC 9562 standard. GUID (Globally Unique Identifier) is Microsoft's name for the same 128-bit identifier. The two terms are used interchangeably. Read more in UUID vs GUID.
Which UUID version should I use?
Use v4 for general-purpose random identifiers. Use v7 if you need IDs that sort chronologically, e.g. as a database primary key. See UUID v4 vs v7 for a full comparison.
Are these UUIDs generated on a server?
No. Every UUID on this page is generated locally in your browser using the Web Crypto API (crypto.getRandomValues). Nothing is sent over the network.
How many UUIDs can I generate at once?
The bulk generator supports up to 1,000 UUIDs per batch, downloadable as .txt, .csv or .json.
What is the chance of a UUID collision?
For UUID v4, the probability of two random UUIDs colliding is astronomically small - roughly 1 in 2.71 quintillion for any two given IDs, even when generating billions of UUIDs. See UUID Format & Size.