SupportQuick overview
Create production-ready output with UUID Generator in seconds, with no sign-up and no server upload.
Free Online UUID v4 & v7 Generator
Generate secure, unique identifiers instantly. Our UUID Generator supports both standard Random UUID v4 and the modern, time-ordered UUID v7. Perfect for developers needing primary keys, session IDs, or bulk test data with flexible formatting options.
What is the BrainyTools UUID Generator?
The BrainyTools UUID Generator is a professional utility designed for software engineers and database architects who require high-entropy, unique identifiers. A UUID (Universally Unique Identifier) is a 128-bit label used for information in computer systems. Our tool goes beyond standard random generation by offering the latest UUID v7 standard, which is specifically optimized for modern database performance.
By generating UUIDs directly in your browser, we ensure that your identifiers are never transmitted over a network until you use them, maintaining the highest levels of privacy and security for your development environment.
Understanding UUID Versions: v4 vs v7
UUID v4 (Random)
The most common version. It is generated using cryptographically strong random numbers. With over 5 undecillion possible combinations, the chance of a collision is practically zero. It is ideal for session IDs, tokens, and general-purpose identifiers.
UUID v7 (Time-Ordered)
The modern standard for databases. v7 embeds a millisecond-precision timestamp at the beginning of the ID. This makes them "lexicographically sortable," which drastically improves indexing performance in databases like PostgreSQL, MySQL, and MongoDB compared to the random v4.
How to Generate and Export UUIDs
- Select Version: Choose between v4 (fully random) or v7 (time-ordered).
- Define Quantity: Enter the number of IDs you need (up to 1,000 per batch).
- Format Options: Toggle between Uppercase and Lowercase, and choose whether to include Hyphens.
- Generate: Click the primary button to populate the results list.
- Copy or Export: Use the single-click copy button or download the list as a .txt or .csv file for easy import into your database or code.
Why Use UUID v7 for Database Primary Keys?
Traditional UUID v4s are scattered randomly across a database index (B-Tree), causing "index fragmentation" and frequent disk I/O as the database re-sorts itself. Because UUID v7is time-sequential, new records are always appended to the "end" of the index.
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