A UUID (Universally Unique Identifier) is a 128-bit identifier that is practically guaranteed to be unique across all space and time. UUID v4 uses cryptographically secure random numbers, making it ideal for database primary keys, session tokens, correlation IDs, and distributed systems. This tool generates UUIDs using the browser's native crypto.randomUUID() API.
Click the 'Generate' button to create a new UUID v4 instantly. Set the quantity (1 to 100) to generate multiple UUIDs at once. You can choose between standard format (with hyphens) and compact format (without hyphens), and toggle uppercase or lowercase output. All generated UUIDs can be copied at once or individually.
UUIDs are used as primary keys in databases (PostgreSQL, MongoDB, DynamoDB), session identifiers in web applications, correlation IDs for distributed tracing, idempotency keys for payment APIs (Stripe, PayPal), unique file names for uploaded content, device identifiers in IoT systems, message IDs in event-driven architectures, and component keys in React applications.
UUID v4 is generated using crypto.randomUUID() which produces 122 random bits with 6 bits reserved for version (0100) and variant (10xx) identification. The probability of collision is approximately 1 in 2^122 (5.3×10^36). UUIDs are 128 bits represented as 32 hexadecimal characters in 8-4-4-4-12 format. The '4' in the third group identifies the version, and the first character of the fourth group (8, 9, a, or b) identifies the variant.
A UUID (Universally Unique Identifier) is a 128-bit number formatted as 32 hexadecimal digits in 5 groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. The probability of generating duplicate UUIDs is astronomically low - about 1 in 5.3×10³⁶.
UUID v4 is generated using random or pseudo-random numbers. The '4' in the third group indicates the version. UUID v4 is the most commonly used version because it requires no coordination between systems.
Yes. This tool uses crypto.randomUUID() (or crypto.getRandomValues() as fallback), which provides cryptographically secure random numbers suitable for security-sensitive applications.
Yes. Set the quantity (up to 100) and click Generate. All UUIDs are generated instantly and can be copied as a list.
Generate cryptographically secure random strings for API keys, tokens, and passwords.
Generate strong, secure passwords with customizable length and character rules.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input.
Transform, format, generate, and encode data instantly. Private, fast, and always free.
Browse All Tools