UUID & Token Generator

A version-4 UUID is a 128-bit identifier whose bits are mostly random, giving an astronomically low chance of two ever colliding — perfect for unique keys and tokens. Unlike sequential IDs (1, 2, 3...) which leak information about your database size, UUIDs are random and reveal nothing about the system's state or data. The probability of a collision is so low (roughly one in 5 billion UUIDs) that it's safely ignored for most applications. v4 UUIDs generated from a good random source are ideal for database primary keys in distributed systems, API request identifiers, and any scenario requiring unique values without coordination between systems.

Yes. They use your browser's secure random source, so they are unpredictable and safe for identifiers and tokens. The browser's crypto.getRandomValues() API provides cryptographically strong randomness suitable for security-sensitive applications, not just casual shuffling. This means generated UUIDs have no predictable pattern and cannot be guessed or brute-forced, making them safe for session tokens, API keys, and security tokens. The randomness is suitable for cryptographic purposes in most applications, though high-security systems should still validate tokens on the server side rather than trusting a client-generated identifier alone.

Yes — generate them in bulk and copy the whole batch for seeding databases or test fixtures. You can generate anywhere from 10 to 1,000 UUIDs at a time and copy them all in one click, formatted as a JSON array, newline-delimited list, or comma-separated values depending on your needs. This bulk generation is handy for populating test databases, creating API test data, or generating a batch of unique identifiers for a new feature launch. You can regenerate the batch as many times as you like to get a fresh set of UUIDs without manually creating each one.