UUID Generator Online Free - Generate UUID v4

What is a UUID and what is it used for?

UUID (Universally Unique Identifier) is a 128-bit identifier generated to be unique worldwide, without needing a central server to coordinate generation. The standard format is a sequence of 32 hexadecimal characters divided into 5 groups by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. Version 4 (v4) is the most widely used and generates values completely at random.

UUIDs are widely used in software development to identify records in databases, user sessions, files, transactions and any entity that needs a globally unique identifier. The advantage over numeric auto-increment is that a UUID can be generated on the client without querying the database, avoiding collisions even in distributed systems.

This tool generates v4 UUIDs using the browser's crypto.randomUUID() API, which uses a cryptographically secure entropy source. You can generate 1 to 100 UUIDs at a time and choose the format: lowercase (RFC standard), uppercase or no hyphens (for systems that don't accept the character).

To use in code, copy the generated UUIDs and paste them directly into your project. The no-hyphen format is useful for databases that store UUIDs as CHAR(32) or in URLs where hyphens can cause ambiguity.