UUID Generator
Generate secure, version 4 Universally Unique Identifiers (UUIDs) instantly.
Why UUIDs Matter
Ensuring absolute uniqueness in the era of distributed systems.
Database Keys
Generate IDs offline across multiple clusters without risk of collisions. Unlike auto-increment, UUIDs don't require a central authority.
API Security
Prevent hackers from scraping data. Sequential IDs like /user/101 are easy to guess; random UUIDs are impossible to predict.
128-Bit Power
Our generator produces Version 4 UUIDs. The probability of a duplicate is 1 in 340 undecillion—vanishingly small.
Developer Best Practices
Casing Standards
Most modern systems (PostgreSQL, Python, Node) store UUIDs in lowercase. Only use uppercase if maintaining a legacy Windows or SQL Server environment.
Seed Data
Generating bulk IDs? Use our "Batch" field to create up to 100 strings at once. Perfect for populating JSON mock files or test databases.
Pro Tip: Storing UUIDs as binary strings rather than plain text can save up to 50% in storage space!