UUID Generator
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Generate one or a hundred version-4 UUIDs on demand using the browser's built-in Web Crypto API — the same cryptographically secure random source used by Node.js and modern browsers, not a pseudo-random fallback. Each identifier follows RFC 4122: 122 bits of randomness plus the version and variant bits, giving collision odds so low they're irrelevant for practically any application. Copy a single value or the whole batch in one click.
Enter a count from 1 to 100, or leave it at 1 for a single identifier.
Click Generate to produce that many v4 UUIDs using crypto.randomUUID(). Clicking again replaces the list with a fresh batch.
Use Copy next to any row for a single value, or Copy All to put the entire newline-separated list on your clipboard at once.
Generate a batch of unique IDs to populate mock database rows or API test payloads without collisions.
Grab a fresh UUID to use as a request idempotency key or client-generated primary key before an insert.
Use a UUID as a collision-safe suffix for temp files, feature-flag keys, or ephemeral cloud resource names.
Quickly get a syntactically valid UUID for a config file, mock response, or UI prototype without spinning up a script.
They come from crypto.randomUUID(), which is backed by the Web Crypto API's cryptographically secure random number generator — not Math.random(). Version 4 UUIDs derive 122 random bits, with the remaining 6 bits fixed to mark the version and variant per RFC 4122.
With 122 random bits, you'd need to generate roughly a billion UUIDs per second for about 85 years before there's a 50% chance of a single collision. For essentially every real-world use case, the risk is negligible.
No. Generation happens entirely in your browser via the Web Crypto API. Nothing is transmitted to a server or stored beyond your current page session.
It's a practical limit for a single on-screen batch. If you need more, generate multiple batches — each one is independently random.
No, this tool only produces v4 (random) UUIDs, which is the version recommended for most applications since it requires no coordination and leaks no timestamp or MAC address information.