What is the probability of a UUID v4 collision?

The probability of generating a duplicate UUID v4 is practically zero — approximately 1 in 2.71 quintillion.

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UUID Generator

Generate cryptographically secure UUID v4 identifiers in bulk.

How to Use UUID Generator

1Select the quantity of UUIDs to generate (1 to 100).
2Choose formatting options (Uppercase vs Lowercase, With or without Hyphens).
3Click 'Generate UUIDs' and copy individual or all generated IDs.

Key Features & Benefits

Uses browser `crypto.randomUUID()` for cryptographic security
Bulk generation up to 100 UUIDs simultaneously
Toggle hyphens and uppercase/lowercase formatting

About UUID Generator

Generate RFC 4122 Version 4 UUIDs (Universally Unique Identifiers) using the browser's cryptographically secure Web Crypto API. Generate 1 to 100 UUIDs at once with uppercase and hyphen controls.

Unlike traditional web tools that send your personal data, uploaded photos, or sensitive text to remote cloud servers, our UUID Generator operates strictly inside your client browser sandbox. This guarantees high processing speeds without network throttling, and ensures your data privacy is completely preserved.