Options
Generated UUIDs
What is a UUID v4?
A UUID (Universally Unique Identifier) is a 128-bit value written as 36 characters, like 3f2a9c1e-8b4d-4f6a-9e2b-7c1d5a8f0e3b. Version 4 UUIDs are generated from random numbers — 122 of the 128 bits are random, which makes the chance of two UUIDs colliding so small it is negligible in practice. This tool uses your browser's built-in cryptographically secure random generator, and nothing ever leaves your device.
When to use UUIDs
UUIDs are the standard way to give records, files, sessions, and API objects an identifier that is unique without any central coordination. They are used as database primary keys, request and trace IDs in distributed systems, file names for uploads, idempotency keys for payments, and device or installation identifiers in mobile apps.
Why generate them in bulk?
Developers and testers often need many identifiers at once — seeding a test database, preparing fixture data, or pre-allocating IDs for an import job. Set the count up to 1000, pick uppercase or hyphen-free formatting if your system requires it, then copy everything to the clipboard or download the list as a plain text file with one UUID per line.