Generate cryptographically secure UUIDs (Universally Unique Identifiers) instantly in your browser. Create single keys or bulk-generate thousands at once with custom formatting.
When building modern distributed systems, relying on an auto-incrementing integer (id: 1, 2, 3) in a database is often a critical bottleneck.
If multiple databases need to merge data, or if clients need to generate IDs offline before syncing to a server, auto-incrementing IDs will collide and cause catastrophic data corruption.
UUIDs solve this. A UUID is so massive that the probability of generating the exact same UUID twice is astronomically close to zero. You could generate 1 billion UUIDs per second for 85 years, and the chance of a single collision would still be around 50%.
Our Bulk UUID Generator goes beyond basic V4 generation:
{...}, force uppercase/lowercase, or even encode them directly into Base64 for extremely compact storage.A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit number used to identify information in computer systems. When generated according to standard methods, UUIDs are practically guaranteed to be unique without depending on a central registration authority.
Version 1 UUIDs are generated based on the current timestamp and the MAC address of the computer generating it. Version 4 UUIDs are generated entirely using random (or pseudo-random) numbers. V4 is the most commonly used version today.
V3 and V5 are 'Namespace' UUIDs. You provide a namespace (which is another UUID) and a name (a string). The generator hashes them together to create a new UUID. V3 uses MD5 hashing, while V5 uses SHA-1 hashing. The same namespace and name will always generate the exact same UUID.
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