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All ToolsUUID Generator
UUID Generator
Generate UUID v4 values using the Web Crypto API. Supports bulk generation, uppercase, and no-hyphens options.
What is UUID Generator?
UUID Generator is a free online tool that creates UUID v4 values using the browser's crypto.randomUUID() API (or a polyfill using crypto.getRandomValues). Generate 1–100 UUIDs at once with options for uppercase and hyphens.
How It Works
UUID v4 uses 122 bits of cryptographically random data. The tool uses crypto.randomUUID() if available, otherwise it generates 16 random bytes using crypto.getRandomValues() and formats them as a UUID per RFC 4122: version bits are set to 4 and variant bits to 10xx.
Key Benefits
- Generates standards-compliant UUID v4
- Uses the secure native Web Crypto API
- Generate 1–100 UUIDs at once
- Toggle uppercase and hyphens
- Copy all or copy individual UUIDs
Frequently Asked Questions
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