UUID Generator
FAQ
What can the UUID generator do?
This is an online UUID generator that runs entirely in your browser, allowing you to quickly generate UUIDs without any installation, login, or internet request. Supported features:
- UUID v4 / v7 generation
- Batch generation of multiple UUIDs
- Toggle uppercase/lowercase formatting
- Enable or disable hyphens
It is commonly used for database primary keys, API identifiers, and distributed system unique IDs.
Which UUID versions are supported, and what is the difference between v4 and v7?
This tool supports UUID v4 and UUID v7:
- UUID v4: Randomly generated UUID, suitable for general-purpose unique identifiers
- UUID v7: Time-based UUID combined with randomness, providing time-ordering which makes it ideal for database indexing, sorting, and high-performance queries
Are UUIDs uploaded to a server?
No. All UUIDs are generated locally in your browser. Nothing is sent to any server, and no user data is collected or stored, ensuring full privacy.
Why is UUID v7 better for databases?
UUID v7 provides time-ordered values, making it more efficient for database usage compared to UUID v4:
- Improved write performance due to reduced random index inserts
- Naturally sortable by creation time
- Better suited for distributed systems and scalable architectures
Are the generated UUIDs standards-compliant?
Yes:
- UUID v4 follows RFC 4122 standard
- UUID v7 follows the RFC 9562 draft standard
This ensures compatibility across systems and libraries.
Are UUIDs sent to a server?
No. UUIDs are generated locally in the browser and are never transmitted to any server.