UUID Generator
Generate one or multiple v4 UUIDs instantly.
What this UUID Generator does
A UUID (Universally Unique Identifier) is a 128-bit value, usually written as 32 hexadecimal digits in five groups separated by hyphens, such as 550e8400-e29b-41d4-a716-446655440000. This tool generates version 4 UUIDs, which are based on random numbers, so each one is effectively unique without needing a central registry or coordination between systems.
Developers use UUIDs as primary keys, request identifiers, file names, session tokens, and anywhere they need an ID that will not collide with one generated elsewhere. This generator lets you create one or many at once and copy them with a single click.
How to use it
Pick how many UUIDs you want using the 1, 5, 10, or 25 buttons, then click Generate. Each identifier appears in its own row. Hover over a row and use its Copy button to copy that single value, or use Copy All to copy the whole list, one UUID per line, ready to paste into code, a spreadsheet, or a database seed file.
Click Generate again at any time to produce a fresh batch. Each click creates brand-new random values, so you never get the same set twice in normal use.
How the UUIDs are generated
The tool uses the browser's built-in crypto.randomUUID() function, which produces RFC 4122 compliant version 4 UUIDs using a cryptographically strong random number generator. That is far more reliable than ad-hoc Math.random() approaches and is the same mechanism used by modern server-side runtimes.
Because version 4 UUIDs draw 122 bits of randomness, the chance of generating the same UUID twice is astronomically small, which is why they are considered safe to use as globally unique identifiers without checking for duplicates.