UUID Generator
Generate random, secure Universally Unique Identifiers (UUID v4) instantly.
What is the UUID Generator?
The UUID Generator is a free, fast online developer utility that allows you to instantly create random Universally Unique Identifiers (UUIDs). Specifically, this tool generates Version 4 UUIDs, which are created using secure random numbers. Whether you need a unique primary key for a database record, a session identifier, or a random filename, this tool provides cryptographically secure IDs in milliseconds.
How to Generate UUIDs
Using the tool is incredibly simple:
- Select quantity: Enter how many UUIDs you want to generate at once (up to 1,000).
- Choose your format: Select whether you want standard lowercase, UPPERCASE, or a format without hyphens.
- Generate: Click the "Generate UUIDs" button. The new IDs will instantly appear in the list.
- Copy the result: Click the "Copy All" button to copy the entire list, or click on any individual UUID to copy just that one.
100% Secure and Client-Side
When generating identifiers for secure systems, you don't want a third-party server keeping a log of the IDs you created. ToolDojo's UUID Generator processes everything locally in your browser. It uses the modern, secure crypto.randomUUID() API built directly into your web browser. Your generated UUIDs are never transmitted over the internet or saved to any server, ensuring complete privacy and security.
Frequently Asked Questions
A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit label used for information in computer systems. The term GUID is typically used by Microsoft developers, while UUID is used everywhere else.
Yes. We generate Version 4 UUIDs using your browser's secure cryptographic random number generator (crypto.randomUUID). The probability of generating a duplicate UUID is so close to zero as to be negligible.
No. All UUIDs are generated entirely within your web browser using JavaScript. Your generated identifiers are never sent over the internet or saved to any server.