Free UUID Generator & Decoder

Generate, format, and inspect Universally Unique Identifiers (UUIDs) directly in your browser. Supports v1, v4, v5, and the new v7 standard.

Use the Tool​

Tool overview​

Our UUID generator is a versatile tool for developers to create and manage Universally Unique Identifiers. It works entirely client-side, meaning your generated IDs are never sent to a server.

What the tool does​

It allows you to instantly generate single or bulk UUIDs in multiple versions (v1, v4, v5, v7) and apply custom formatting like uppercase, removing hyphens, or wrapping in quotes and braces. It also features a decoder to inspect existing UUIDs and verify their version and validity.

What problems it solves​

Developers often need quick dummy IDs for databases, testing, or mocking APIs. This tool provides an easy interface to quickly grab correctly formatted IDs without opening a terminal or writing a quick script.

Who should use it​

Software engineers, database administrators, testers, and anyone working with unique identifiers in software development.

Why it matters​

Choosing the right UUID version is critical for performance. For instance, using the new UUIDv7 in databases prevents index fragmentation caused by the randomness of v4, while v4 remains the standard for general random identifiers.

How It Works​

Input​

Select the UUID version you need, set a quantity, and choose your preferred formatting options (like hyphens, braces, or quotes).

Processing​

The tool uses industry-standard, strongly analyzed JavaScript libraries (uuid and uuidv7) to randomly generate or derive the IDs based on your selections instantly in your browser memory.

Limitations​

There are no strict limits, but generating ultra-large batches (e.g., millions of UUIDs) could slow down your browser tab. Stick to a few thousand for instant results.

Output​

The resulting UUIDs are displayed in a textarea. You can copy them in bulk or individually. If you enabled bulk options, they can be output as newlines, comma-separated lists, or JSON arrays.

Frequently Asked Questions​

What is the difference between UUID v4 and v7?​

UUIDv4 is completely randomly generated, making it excellent for unguessable IDs. UUIDv7 is time-ordered but includes random bytes, meaning it sorts chronologically to prevent database indexing performance issues while maintaining uniqueness.

Is this tool secure?​

Yes, generation happens 100% locally in your browser using cryptographically secure random number generation APIs. No data is sent to a server.

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