Generate cryptographically random UUID v4 identifiers. Generate one or multiple UUIDs at once. Copy individual UUIDs or all at once. Useful for databases, APIs, and unique identifiers.
A UUID generator creates Universally Unique Identifiers — 128-bit values formatted as 32 hexadecimal digits that are virtually guaranteed to be unique worldwide. Version 4 UUIDs are generated using cryptographic randomness, making them ideal for database keys, API identifiers, and session tokens. Our browser-based tool uses the Web Crypto API (crypto.randomUUID) to generate truly random UUIDs with options for bulk generation, uppercase formatting, and dash removal. All generation happens locally in your browser, ensuring your identifiers are created privately without any server involvement.
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hex digits in 5 groups (e.g., 550e8400-e29b-41d4-a716-446655440000). Version 4 UUIDs are randomly generated.
The probability of generating two identical UUID v4s is astronomically small — about 1 in 5.3 × 10^36. You'd need to generate 1 billion UUIDs per second for about 85 years to have a 50% chance of a collision.
UUIDs are commonly used as database primary keys, API request identifiers, session tokens, and anywhere you need a globally unique identifier without a central authority.
Yes. They're generated using crypto.randomUUID() which uses the Web Crypto API for cryptographic randomness. They're generated entirely in your browser.