UUID Generator
Generate one or many UUID v4 identifiers using the browser's cryptographic random source. Nothing uploaded, nothing predictable.
Private by construction. The conversion happens in this page's JavaScript. Nothing you paste here leaves your machine, and the tool keeps working with the network unplugged.
Generates version-4 UUIDs from crypto.randomUUID(), the browser's cryptographically secure random source — not Math.random(), which some online generators quietly use and which produces guessable identifiers. Type a count, get that many, one per line, ready to paste into a database seed, a test fixture, or a config file.
Questions this tool gets asked
Are these UUIDs cryptographically random?
Yes. They come from the Web Crypto API's secure random source, the same generator browsers use for key material. UUIDs from Math.random()-based tools can collide or be predicted; these cannot in any practical sense.
Can two generated UUIDs collide?
The random space of UUID v4 is 122 bits. You would need to generate roughly a billion UUIDs per second for decades to reach even a remote chance of one collision.
Are the UUIDs logged anywhere?
No. They are generated inside your browser tab and appear nowhere else unless you paste them somewhere.