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UUID v4 and v7 generator

Generate one or a thousand unique identifiers for databases, tests and APIs. Version 7 UUIDs sort by the moment they were created.

Runs in your browser. Nothing is uploaded.

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How to use the UUID generator

  1. Choose version 4 or version 7 and how many you need.

  2. Choose the format: upper or lower case, with or without hyphens.

  3. Copy the list.

Frequently asked questions

Should I use UUID v4 or v7?

Use v7 for database keys: it starts with a timestamp, so new rows are inserted in order. Use v4 when the identifier must not reveal when it was created.

Can two generated UUIDs be the same?

In practice, no. A v4 UUID has 122 random bits, so a duplicate is less likely than winning the lottery several times in a row.

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