Generate cryptographically random UUIDs (v4). Bulk generate up to 100 at once.
A UUID (Universally Unique Identifier) is a 128-bit value designed so that the chance of two independently generated UUIDs ever colliding is astronomically small — small enough that developers rely on them as unique keys across distributed systems without needing a central authority to hand out IDs. This tool generates version 4 UUIDs, the fully random variant, in bulk and in several common formatting styles.
What are UUIDs commonly used for?
Database primary keys, API tokens, file naming, session identifiers, and request tracking IDs are among the most common uses — anywhere you need a unique identifier without coordinating with a central system to avoid duplicates.
Is it really impossible for two UUIDs to collide?
Not mathematically impossible, but the probability is so vanishingly small under normal use that it's treated as effectively impossible in practice — you'd need to generate billions of UUIDs before the odds of a collision became meaningfully non-zero.
What does "v4" mean in UUID v4?
It refers to the UUID specification version. Version 4 UUIDs are generated using random or pseudo-random numbers, as opposed to other versions that incorporate timestamps or hardware identifiers.