UUID / GUID Generator
Generate cryptographically random v4 UUIDs in bulk with uppercase, braces, and hyphen formatting options.
How to Use UUID / GUID Generator
Choose how many UUIDs you need (1โ500) and your format options (uppercase, hyphens, braces, quote wrapping).
Click "Generate UUIDs".
Review the generated list โ each UUID is cryptographically random and unique.
Copy an individual UUID or copy/download the entire batch.
About UUID / GUID Generator
Create RFC 4122 version 4 (random) UUIDs instantly for database keys, distributed system identifiers, API request IDs, test fixtures, and license keys. Generation uses your browser's hardware-backed Web Crypto random number generator (crypto.getRandomValues) โ the same class of entropy used for TLS โ not a predictable Math.random shortcut. Generate up to 500 UUIDs per batch with one-click formatting options: uppercase, braces, no hyphens, and prefix/suffix wrapping for direct paste into code, SQL, or config files.
Frequently Asked Questions
What is a version 4 UUID?
A 128-bit identifier built from 122 random bits (six bits are fixed to mark the version and variant), formatted as 8-4-4-4-12 hexadecimal characters. With 5.3 x 10^36 possible v4 UUIDs, the chance of two ever colliding in your system is astronomically small.
How random are the generated UUIDs?
They use the Web Crypto API's cryptographically secure random number generator (CSPRNG), suitable for identifiers where unpredictability matters. This is significantly stronger than Math.random()-based generators found in many online tools.
Are my UUIDs logged or seen by the server?
No. Generation happens locally in your browser with zero network requests โ if you need identifiers for security-sensitive use, they were never exposed anywhere.
Can I generate other UUID versions (v1, v5)?
This tool focuses on v4 random UUIDs โ the most widely used version and the default in modern databases and frameworks. Time-based (v1) and name-based (v5) variants have niche use cases and require different inputs.
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