UUID Generator

1. Choose v4 · random or v7 · time-ordered under Version.
2. Set Quantity to any number from 1 to 100.
3. Press Generate UUIDs. Each value has its own copy button, and Copy all copies the whole list with one UUID per line.
4. Press Regenerate for a fresh set.

A UUID v4 has 122 random bits plus fixed version and variant bits, and is generated with crypto.randomUUID(). It reveals nothing about when or where it was made, which makes it a good default for public identifiers, IDs in URLs and anything that should not be guessable or ordered.

A UUID v7, defined in RFC 9562, starts with a 48-bit Unix timestamp in milliseconds followed by 74 random bits. Values created later sort after earlier ones, so new rows in a B-tree index land next to each other instead of at random positions, which is why v7 is popular for database primary keys. The trade-off is that anyone can read the creation time from the first 12 hex digits. Values generated in the same millisecond are not guaranteed to be in order.

UUIDs use the standard 36-character form: 32 lowercase hexadecimal digits in groups of 8-4-4-4-12, such as 017f22e2-79b0-7cc3-98c4-dc0c0c07398f for v7. The first digit of the third group shows the version, 4 or 7. GUID is Microsoft's name for the same format, so these values work wherever a GUID is expected.

Both versions use the browser's cryptographically secure random number generator, never Math.random(). With 122 random bits in every v4 value, a collision is so unlikely that you can treat each value as unique without checking a central registry.

UUIDs are generated on your device, and the tool never sends them to a server. They are gone once you leave the page.

Like the rest of the site, this page uses Google Analytics and Yandex Metrica, including Metrica session replay. Tool events report only that the tool was opened or used.

The tool area is marked so that Metrica masks what you type and the results in its session recordings.