UUID Generator
Generate cryptographically random UUID v4 identifiers online. Bulk-generate up to 100 at once, uppercase or hyphen-free options.
Runs entirely in your browser — no uploadsAbout this tool
UUID Generator creates version-4 UUIDs from your device’s cryptographic randomness (Web Crypto), yielding 122 random bits — collision odds are astronomically small.
Generate up to 100 at once, optionally uppercased or stripped of hyphens, then copy all with one click.
FAQ
How random are these UUIDs?
They come from crypto.getRandomValues — a cryptographically secure random source, not Math.random.
Can UUIDs collide?
Practically never. You’d need to generate billions per second for centuries to expect a single duplicate.
What’s the difference between v4 and v1?
v4 is pure randomness; v1 embeds timestamps and hardware addresses. v4 is preferred for privacy and simplicity.