UUID Generator
Generate random UUID v4 identifiers — cryptographically secure.
What Is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is practically guaranteed to be unique. UUID v4 uses random numbers to generate identifiers in the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. They're widely used in databases, APIs, distributed systems, and session management.
How to Generate UUIDs
Click "Generate UUID" to create one or more random v4 UUIDs. Set the count to generate multiple at once (up to 100). Options include uppercase formatting and surrounding braces. All UUIDs are generated using the browser's cryptographic random number generator.
Is This Generator Free?
Yes, 100% free and private. UUIDs are generated locally using crypto.randomUUID() or a secure fallback. Nothing is stored or transmitted.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hexadecimal digits in 5 groups (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are used as unique IDs in databases, APIs, and distributed systems.
Are the UUIDs generated securely?
Yes. We use the crypto.randomUUID() API when available, falling back to crypto.getRandomValues() — both provide cryptographically secure randomness.
Can two UUIDs ever be the same?
Theoretically possible, but practically impossible. The probability of a collision is approximately 1 in 2^122 — you would need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of one duplicate.
Is this tool free and private?
Yes. UUIDs are generated in your browser. Nothing is sent to any server.
What UUID version does this generate?
This tool generates UUID v4, which uses random or pseudo-random numbers for all components.