Generate cryptographically random UUIDs in bulk — v4 standard.
UUID Generator is a free online tool that creates cryptographically random UUID v4 (Universally Unique Identifiers) in bulk. UUIDs are 128-bit identifiers that are guaranteed to be unique across space and time, used extensively in databases, APIs, and distributed systems. The generator uses the Web Crypto API for true cryptographic randomness, producing UUIDs in the standard format (xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx). You can generate single UUIDs or bulk generate hundreds at once, with options for uppercase/lowercase and with/without hyphens. UUIDs solve the problem of generating unique identifiers without a central authority. Unlike auto-incrementing database IDs, UUIDs can be generated independently on any device and are virtually guaranteed to never collide. The probability of generating two identical UUID v4s is approximately 1 in 5.3 × 10^36. Everything runs entirely in your browser. Generated UUIDs are never sent to any server. There are no usage limits and no account required. Common use cases include generating primary keys for databases, creating unique identifiers for API resources, generating session tokens, creating correlation IDs for distributed tracing, assigning unique identifiers to uploaded files, and generating idempotency keys for API requests. For related tools, check out the Password Generator for secure random strings, or the Hash Generator for creating deterministic identifiers from data.