UUID Generator
Generate RFC 4122 compliant UUIDs (Universally Unique Identifiers) instantly. UUIDs are 128-bit numbers used to uniquely identify information in computer systems.
Perfect for database primary keys, transaction IDs, or any scenario requiring unique identifiers. Choose from different UUID versions based on your needs.
545a957f-2a7a-4800-b9a4-5af5a3f192e4
Version Guide
v4 (Random) RFC 4122
Most common. Fully random, no patterns. Best for general use.
v1 (Timestamp) RFC 4122
Based on timestamp + MAC address. Sortable by time, but may expose device info.
v7 (Unix Time) RFC 9562
Modern standard (2024). Unix timestamp + random. Best for databases (sortable, no MAC exposure).
All UUIDs follow IETF standards: RFC 4122 (v1-v5) and RFC 9562 (v6-v7)
Common Use Cases
Database Primary Keys
Use UUIDs instead of auto-increment IDs for better scalability in distributed databases like PostgreSQL, MongoDB, or Cassandra.
API Request Tracking
Generate unique request IDs for logging and debugging across microservices and distributed systems.
Session Tokens
Create secure, unique session identifiers for user authentication without exposing sequential patterns.
File Naming
Generate unique filenames for uploads to avoid collisions in cloud storage like S3 or GCS.
Frequently Asked Questions
What is a UUID and why should I use it?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across all devices and time. Unlike auto-increment IDs, UUIDs can be generated offline without database coordination, making them ideal for distributed systems, microservices, and scenarios where you need to generate IDs before inserting into a database.
Which UUID version should I use?
UUID v4 is recommended for most cases — it's fully random and widely supported. Use UUID v7 if you need time-sortable IDs (great for databases as it improves index performance). Avoid UUID v1 in production as it can expose your MAC address.
Is this UUID generator safe to use?
Yes! All UUIDs are generated server-side using cryptographically secure random number generators. No data is stored or logged. The generation follows official IETF standards (RFC 4122 and RFC 9562).