UUID Generator
Generate cryptographically secure Version 4 UUIDs (Universally Unique Identifiers) in bulk.
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About the UUID Generator
A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit label used to uniquely identify database records, API sessions, and distributed systems without centralized coordination.
How to Use the UUID Generator
- 1Choose how many UUIDs you want to generate (1, 5, 10, 25, 50, or 100).
- 2Configure options: Uppercase vs Lowercase and Include/Remove Hyphens.
- 3Click "Generate UUIDs" to create fresh unique identifiers.
- 4Copy individual UUIDs or click "Copy All" / "Download List".
How It Works & Underlying Logic
UUID v4 identifiers use 122 cryptographically random bits generated via window.crypto.getRandomValues() / crypto.randomUUID(), formatted into five hexadecimal groups separated by hyphens (8-4-4-4-12).
Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx (where 4 is version and y is variant 8, 9, a, or b)Practical Calculation Examples
Standard UUID v4
Default lowercase hyphenated UUID
Uppercase Without Hyphens
Compact format for specific database keys
Helpful Tips & Best Practices
- •The probability of a UUID v4 collision is practically zero (1 in 5.3 × 10³⁶).
- •UUIDs are ideal for primary keys in distributed microservices and offline database sync.
UUID Generator FAQ
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