Free Online UUID v4 Generator
Generate random RFC4122 Version 4 UUIDs instantly in bulk with customizable casing and formatting options.
What is a UUID?
A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit value standardised by RFC 4122. Version 4 UUIDs use random numbers and have an astronomically low collision probability (1 in 2122).
time_low -time_mid-ver&time_hi-variant-node_id
Common Use Cases
Database Primary Keys — UUID primary keys allow distributed systems to generate records without central coordination, making them ideal for microservices and replicated databases.
Session & Token IDs — API session tokens, OAuth state parameters, CSRF tokens, and webhook secret keys.
File Storage — Naming uploaded files with UUIDs prevents filename collisions and directory traversal attacks.
Learn Backend Engineering & Database Design
DoxaTech Hub teaches PostgreSQL UUID primary keys, REST API design, authentication, and full-stack deployment in Month 6 of the curriculum.
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