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UUID Generator
Random version 4 or time-ordered version 7 UUIDs, one or a thousand at a time — and a checker for any UUID.
FreeRuns in your browser
About the UUID Generator
Generate UUIDs for databases, APIs and test data. Version 4 is fully random; version 7 starts with the time it was made, so new IDs sort after old ones and index well. Make up to 1,000 at once, in upper or lower case, with or without hyphens, and paste any UUID to see its version.
How to use it
- 1Choose version 4 (random) or version 7 (time-ordered).
- 2Set how many you need and the format.
- 3Copy them all or download them as a text file.
Questions
Should I use UUID v4 or v7?
Use v7 for database keys: IDs made later sort later, which keeps indexes compact. Use v4 when the ID must not reveal when it was created, because v7 carries its creation time.
Can two generated UUIDs be the same?
In practice, no. A v4 UUID has 122 random bits; you would need to generate about a billion per second for 85 years to reach even a 50% chance of one duplicate.
Is my text uploaded or stored?
No. The tool runs in this browser tab. What you paste is never sent to KuponGuru, and it is gone when you close the tab.
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