UUID / GUID Generator (v4)
Generate cryptographically secure v4 UUIDs (Universally Unique Identifiers) in bulk directly in your browser using native crypto APIs.
Why Cryptographically Secure UUID Generation Matters
Universally Unique Identifiers (UUIDs), also known as Globally Unique Identifiers (GUIDs), are standardized 128-bit labels used in software architecture to identify entities without a central coordinating authority.
Crypto.randomUUID() vs Math.random()
In web browsers, early UUID generators relied on Math.random(), which uses pseudo-random number generators (PRNG) susceptible to seed guessing. CodAI uses the browser's native Web Cryptography API (crypto.randomUUID()), leveraging hardware entropy sources to guarantee cryptographically secure random bits.
How to Use UUID / GUID Generator (v4)
- Select the quantity of UUIDs to generate (1 to 100).
- Toggle uppercase / lowercase formatting options.
- Click "Generate UUIDs" to produce new random cryptographically secure UUIDs.
- Click "Copy UUIDs" to copy the generated list to your clipboard.
Examples
Sample UUID v4 Standard Output
Quantity: 1
f47ac10b-58cc-4372-a567-0e02b2c3d479
Frequently Asked Questions
What is a Version 4 UUID?
A UUID v4 is a 128-bit randomly generated identifier. It contains 122 random bits and 6 fixed variant/version bits, formatted as 32 hexadecimal digits separated by hyphens (8-4-4-4-12).
What is the probability of a UUID collision?
The collision probability of UUID v4 is astronomically low. You would need to generate approximately 1 billion UUIDs per second for 85 years to have a 50% chance of a single collision.
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