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UUID Generator (v4) | JSON Organizer
Generate standard RFC 4122 compliant UUIDs (Universally Unique Identifiers) instantly. UUIDs are 128-bit numbers used to uniquely identify information in computer systems without significant central coordination. Our primary generator creates Version 4 UUIDs, which are based on random numbers, ensuring an incredibly low probability of collision even across distributed systems.
Whether you are setting up primary keys for a database (like PostgreSQL or MongoDB), generating unique session identifiers, or creating filenames for cloud storage, our UUID tool is your go-to resource. We support bulk generation, allowing you to create hundreds of IDs at once with various formatting options (lowercase, uppercase, or with/without hyphens). It runs entirely in your browser, making it fast, free, and secure.
Key Features
- ✓Generate single or bulk UUID v4 strings
- ✓RFC 4122 compliant identifiers
- ✓Toggle hyphens and letter casing (Upper/Lower)
- ✓One-click to copy all generated IDs
- ✓Zero server latency - 100% client-side
- ✓Essential for database indexing and API development
Frequently Asked Questions
What does UUID stand for?
UUID stands for Universally Unique Identifier. It is a 128-bit number used to identify information in computer systems. For practical purposes, a UUID generated by a reputable algorithm is considered unique across time and space.
What is the difference between UUID v1 and v4?
UUID v1 is generated using the host's MAC address and a timestamp. UUID v4 is generated using random (or pseudo-random) numbers. v4 is generally preferred for privacy and simplicity in modern web applications.
Can two UUIDs ever be the same?
While mathematically possible (a 'collision'), the probability is so astronomically small that it is effectively zero. You would need to generate billions of UUIDs every second for centuries to see a single overlap.
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