UUID / GUID Generator (v4)
Generate cryptographically random UUID v4 identifiers using native browser crypto APIs.
Generated UUID v4
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How to Generate Cryptographically Secure UUIDs (v4)
- Select quantity of UUIDs to generate (1 to 50).
- Toggle formatting options: Uppercase, Hyphens, or Braces.
- The tool generates version 4 UUIDs using the Web Cryptography API (`crypto.getRandomValues()`).
RFC 4122 Version 4 UUID Specification
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128-bit identifier with 122 bits of cryptographically secure entropy:
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. - The collision probability is so negligible that generating 1 billion UUIDs per second for 100 years carries an infinitesimal collision chance.
Example
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c8f2b7a1-3b4e-4e9f-8a21-9e7f5b3a2d10
Common Applications
- Primary keys for distributed databases (PostgreSQL, MongoDB, DynamoDB).
- Session IDs, correlation tokens, and idempotency keys in microservices.
- Unique transaction identifiers for e-commerce orders.
Frequently Asked Questions
Are these UUIDs cryptographically random?
Yes. They are generated using browser-native CSPRNG (`crypto.getRandomValues()`), not pseudo-random Math.random().
What is the difference between UUID and GUID?
UUID is the international RFC 4122 standard term; GUID is Microsoft’s implementation terminology for the same 128-bit structure.