🍋 Privacy & Security
UUID Generator
Generate and validate UUIDs (v4 random)
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About UUID Generator
Generate cryptographically random UUID v4 identifiers. Validate and parse existing UUIDs. Shows version, variant, and multiple format variations.
How It Works
Uses crypto.getRandomValues() to generate RFC 4122 compliant version 4 UUIDs. The version bits (4) and variant bits (10) are set according to the spec.
Step by Step
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Tips
- UUID v4 uses 122 random bits — collision probability is astronomically low
- UUIDs are 128-bit identifiers, universally unique without coordination
- Use crypto.getRandomValues() (this tool does) for proper randomness
Frequently Asked Questions
How unique are UUID v4s?
With 122 random bits, you'd need to generate 2.71 quintillion UUIDs to have a 50% chance of one collision. For practical purposes, they're unique.
What UUID version should I use?
v4 (random) is the most common choice. v7 (time-ordered) is gaining adoption for database primary keys since it's sortable. v1 (MAC+time) has privacy concerns.