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Understanding UUID Versions
A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems.
- Version 4: The industry standard. Uses random numbers. Best for general use where sorting doesn't matter.
- Version 7: The modern successor to v1. Includes a timestamp so IDs are generated in order. Perfect for database primary keys.
Frequently Asked Questions
Version 4 is completely random, making it great for most uses but hard to index efficiently in databases. Version 7 is time-sortable (it starts with a timestamp), which makes it much faster for databases to index and sort.
Yes. The probability of a collision (two identical UUIDs) in Version 4 is roughly 1 in 2.7 quintillion. You are more likely to be hit by a meteorite than generate a duplicate UUID.
This tool is optimized to generate up to 500 UUIDs per batch directly in your browser without lag.
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