UUID Generator
UUID (Universally Unique Identifier) is a 128-bit identifier standardized in RFC 4122. It guarantees global uniqueness without a central coordinating authority, making it ideal for distributed systems, databases, and microservices.
How UUID v4 Works UUID version 4 is generated entirely from random numbers — 122 of 128 bits are filled with a cryptographically strong generator. The probability of a collision (two UUIDs matching) is extraordinarily low: generating one billion identifiers per second for 85 years yields less than a 50% chance of a single collision. UUID format: 8-4-4-4-12 hexadecimal digits (e.g., 550e8400-e29b-41d4-a716-446655440000).
Free online UUID version 4 (random) generator. UUID (Universally Unique Identifier) is a 128-bit identifier that guarantees uniqueness without a central coordinating authority. The UUID standard is defined in RFC 4122 and is widely used in distributed systems where centralized ID generation is impractical.
UUID v4 is generated entirely from random numbers — 122 of 128 bits are filled with a cryptographically strong generator (crypto.randomUUID). The probability of a collision when generating one billion UUIDs per second for 85 years is less than 50%, making the format practically unique for any real-world task.
Create a single UUID with one click or generate a batch of up to 100 identifiers at once. Each UUID can be copied individually, and the "Copy all" button places the entire list in the clipboard. Perfect for developers creating primary keys, session identifiers, tokens, and other unique values.