UUID Generator — Free Online Tool
Generate one or many UUID v4 (randomly generated) identifiers instantly. Uses the browser's built-in crypto.randomUUID() which is backed by the operating system's cryptographically secure pseudo-random number generator. Safe for use as database primary keys, session tokens, and idempotency keys.
100% client-side. No uploads. Your data never leaves your browser.
How to use UUID Generator
- Enter how many UUIDs you want (1–100) using the counter.
- Click 'Generate' to produce fresh random UUIDs.
- Copy all UUIDs at once or click an individual UUID to copy just that one.
- Toggle 'Uppercase' to change the output format if your system requires it.
Frequently Asked Questions
Is UUID v4 truly random?
UUID v4 uses 122 bits of cryptographic randomness (from crypto.randomUUID), making collisions astronomically unlikely — roughly 1 in 10^36 per pair of UUIDs.
What is the difference between UUID and GUID?
GUID (Globally Unique Identifier) is Microsoft's term for the same concept. The format and collision properties are identical.
Can I use these as database primary keys?
Yes, but be aware that random UUIDs cause index fragmentation in B-tree indexes. UUID v7 (time-ordered) is better for database keys, though this tool generates v4.
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