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Crypto.randomUUID Engine

UUID / GUID GENERATOR

Instantly generate thousands of Universally Unique Identifiers. Perfect for database keys, session tokens, and cryptographic salts.

Parameters

V4 uses the hardware RNG. V1 uses your current time + simulated MAC.

Results

Click generate to see UUIDs

Generated: 0 UUIDs 0ms

About the Free UUID Generator

Crypto.randomUUID Performance

Our V4 engine directly taps into your browser's native cryptography APIs. This allows generation speeds that can pump out 10,000 completely unique GUIDs in just a few milliseconds, totally offline.

Version 1 & 4 Support

Whether you need purely random security strings (V4) or timestamp-sequenced identities (V1) for specific database indexing optimization, both options are fully supported.

Custom Formatting

Format the output exactly how your codebase needs it. Strip hyphens for smaller storage footprints, or wrap them in braces for legacy Microsoft SQL Server GUID compatibility.

Zero Server Logging

Never generate API keys or security tokens on third-party servers. Since everything runs strictly in your browser's memory, we never see the UUIDs you generate.

Frequently Asked Questions

Nothing. UUID stands for "Universally Unique Identifier" while GUID stands for "Globally Unique Identifier". GUID is simply Microsoft's implementation term for the exact same standardized 128-bit architecture.

In 99% of modern applications, you should use Version 4. V4 generates purely random data which is highly secure and prevents enumeration attacks. Version 1 includes your MAC address and the current time, making it predictable, which is only useful for very specific legacy database sorting optimizations.

Mathematically, yes. Practically, no. The number of random Version 4 UUIDs is 2^122. You would need to generate 1 billion UUIDs every second for 85 years to reach a 50% chance of a single collision.