What is a UUID Generator?

A UUID generator is a tool that creates Universally Unique Identifiers (UUIDs): also known as GUIDs (Globally Unique Identifiers). UUIDs are 128-bit identifiers formatted as 32 hexadecimal characters in five groups separated by hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). They are designed to be unique across space and time without requiring a central registry: making them ideal for distributed systems, database primary keys, session IDs, and API resource identifiers.

CodeHelper's UUID/GUID Generator uses the browser's native crypto.randomUUID() for cryptographically secure v4 UUIDs and supports bulk generation of up to 1,000 identifiers at once.

UUID Versions Explained

UUID v4 (Random): The most widely used version: 122 bits of cryptographically random data. Virtually collision-free for all practical applications.
UUID v1 (Timestamp): Based on the current timestamp and MAC address. Sortable by creation time but reveals timing information.
Nil UUID: All zeros (00000000-0000-0000-0000-000000000000): used as a null or default value in systems that require UUID format.
Max UUID: All ones (all f's): the maximum possible UUID value, used in some range-query contexts.

How to generate a UUID

Select the UUID version (v4 Random, v1 Timestamp, Nil, or Max).
Choose the output format: standard, no hyphens, uppercase, braces, or URN.
Set the quantity for bulk generation (1–1,000 UUIDs).
Click Generate to produce the identifiers.
Copy individual UUIDs, copy all, or download as a text file.

Whether you are creating database primary keys, generating session tokens, building distributed systems, or seeding test data, this free UUID generator produces cryptographically secure identifiers instantly with no server-side processing.

UUID/GUID Generator