Instantly generate hundreds of unique UUIDs completely locally.
A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122, formatted as 32 hexadecimal digits displayed in five groups separated by hyphens. Version 4 UUIDs, which this tool generates, are created using random or pseudo-random numbers. The probability of generating a duplicate UUID v4 is astronomically low—you would need to generate approximately 2.71 quintillion UUIDs to have a 50% chance of a single collision. This makes UUIDs ideal for distributed systems where multiple nodes need to generate unique identifiers independently without coordination.
Our generator uses the browser's native crypto.getRandomValues() method to produce cryptographically secure random numbers, ensuring each UUID meets the highest standards of randomness. The bulk generation feature allows you to create hundreds of UUIDs in a single click, which is invaluable for database seeding, test data generation, and batch operations. The one-click copy feature formats all UUIDs for immediate use in your code or database queries.
For all practical purposes, yes. UUID v4 uses 122 bits of randomness. The total number of possible values is approximately 5.3 times 10 to the 36th power. The probability of a collision is negligible for any real-world application, even at massive scale.
Both have trade-offs. UUIDs are better for distributed systems, data migration, and security (they prevent enumeration). Auto-incrementing integers are more storage-efficient and produce ordered data. Many applications use UUIDs for public-facing identifiers while keeping internal sequential IDs.
UUID v1 includes a timestamp and MAC address, making it partially predictable. UUID v4 is entirely random. For most applications, v4 is preferred for its simplicity and unpredictability.