UUID Generator
Generate v4 UUIDs one at a time or in bulk batches. Free to use, no signup required for occasional use.
What is the UUID Generator?
The UUID Generator is a free online tool that generates version 4 UUIDs — universally unique identifiers made up of 32 hexadecimal characters formatted as a standard 36-character string with hyphens. UUIDs are used throughout software development as unique identifiers for database records, API resources, session tokens, and distributed system entities, because their randomness makes collisions between two independently generated UUIDs astronomically unlikely, even without a central coordinating authority. Developers frequently need a handful of UUIDs on the spot — for seeding test data, populating a mock API response, or generating placeholder IDs while prototyping a schema — and this tool provides that instantly in the browser using a cryptographically strong random source. Beyond generating a single UUID, it supports bulk generation, producing 10, 50, or 100 UUIDs in one click, which is especially useful for populating test fixtures or seed scripts where you need a batch of unique identifiers ready to paste in at once, rather than clicking 'generate' repeatedly.
How to use it
Click one of the generate buttons — Generate 1 for a single UUID, or Generate 10, 50, or 100 for a bulk batch. The requested number of version 4 UUIDs appears immediately in the results list below, each on its own line. Use the copy button next to an individual UUID to copy just that one, or use the 'Copy' button above the list to copy the entire batch at once, ready to paste into a database seed script, test fixture file, JSON mock data, or configuration file. If you need a fresh batch, simply click a generate button again — every click produces a brand new, independently random set of UUIDs rather than reusing previous ones.
Frequently asked questions
What version of UUID does this tool generate?
It generates version 4 UUIDs, which are based on random numbers and are the most commonly used UUID version for general-purpose unique identifiers.
Can I generate more than one UUID at a time?
Yes, you can generate a single UUID or bulk-generate 10, 50, or 100 at once, each shown on its own line for easy copying.
Are the UUIDs guaranteed to be unique?
Version 4 UUIDs are generated from a cryptographically strong random source, making the probability of a collision between any two UUIDs negligibly small in practice.
Can I copy all generated UUIDs at once?
Yes, a single copy button copies the entire batch as a newline-separated list, ready to paste into scripts or data files.