How to Generate UUIDs Online
A UUID (Universally Unique Identifier) is a 128-bit value that guarantees uniqueness across systems without a central authority. They are essential for database primary keys, distributed tracing, and API idempotency. This guide covers generating UUIDs and choosing the right version.
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Open the UUID Generator
Navigate to the UUID Generator in the Security category. The tool loads with a freshly generated UUID v4 ready to copy.
Select the UUID version
Choose from UUID v1 (timestamp-based), v4 (random), or v7 (timestamp-ordered random). Version 4 is the most common choice for general-purpose identifiers.
Set the quantity
Need multiple UUIDs at once? Set the bulk count to generate up to 100 UUIDs in a single click. Each one is cryptographically random and unique.
Choose format options
Toggle between standard hyphenated format (550e8400-e29b-41d4-a716-446655440000), uppercase, no-hyphens, or braces for GUID-style output. Pick whatever your system requires.
Copy and use
Click any generated UUID to copy it instantly, or use the bulk copy button to grab all of them separated by newlines. Paste directly into your code, database seed, or config file.
Pro Tips
- *Use UUID v7 for database primary keys — its timestamp prefix keeps B-tree indexes efficient.
- *UUID v4 is the safest default when you only need uniqueness and do not care about ordering.
- *Never expose UUID v1 in public APIs — it contains your MAC address.
- *If you need shorter IDs, consider NanoID or ULID, but UUIDs remain the industry standard for interoperability.
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