UUID generator
Generate version 4 UUIDs (GUIDs) one at a time or in bulk — securely, in your browser.
Runs 100% in your browserHow to generate a UUID
- Choose how many. Set the count for a single UUID or a batch.
- Pick formatting. Optionally uppercase, remove hyphens, or wrap as quoted strings.
- Generate and copy. Click Generate, then Copy or Download the result.
About UUIDs
UUIDs let independent systems mint identifiers — database rows, API resources, event IDs, file names —
that won't collide without coordinating with each other. Version 4 is the workhorse: 122 random bits make
duplicates effectively impossible. This generator uses your browser's built-in
crypto.randomUUID(), so the values are both standards-compliant and never transmitted.
Frequently asked questions
- A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value written as 32 hexadecimal digits in five hyphen-separated groups (8-4-4-4-12). It is designed to be unique without a central authority.
- A v4 UUID is generated from random numbers (122 random bits). The collision probability is astronomically small, which is why v4 is the default for most applications.
- Yes. They are produced by crypto.randomUUID() in your browser, which uses a cryptographically secure random source. Nothing is generated on or sent to a server.
- Yes — set the count and generate up to 1,000 UUIDs in one batch, then copy or download them all.