UUID / GUID Generator

Generate UUIDs and GUIDs Instantly

Create random, unique identifiers in seconds by choosing a UUID version and the format options you need.

Everything runs directly in your browser using a cryptographically secure random generator — no data is sent anywhere, and no identifiers are stored.

What Is a UUID / GUID?

A UUID (Universally Unique Identifier), also called a GUID (Globally Unique Identifier) on Microsoft platforms, is a 128-bit value used to identify information without requiring a central authority to avoid collisions.

UUIDs and GUIDs use the exact same 36-character format — the names are just different conventions for the same standard, so any UUID generated here is also a valid GUID.

Why Use a UUID / GUID Generator?

Manually inventing unique identifiers is unreliable — collisions, typos, and predictable patterns can all cause bugs and security issues.

A generator produces properly formatted, statistically unique identifiers instantly, following the official UUID specification (RFC 9562).

Why Generate UUIDs Online?

• Create statistically unique identifiers with virtually zero collision risk
• Choose the right version for your use case (random or time-ordered)
• Generate many identifiers at once for bulk data seeding
• Format the output to match your database or API requirements
• No installation or account required
• Works entirely offline in your browser

Key Features

• Two versions: UUID v4 (fully random) and UUID v7 (time-ordered)
• Generate 1, 5, 10, or 50 identifiers at once
• Optional UPPERCASE formatting
• Optional removal of hyphens for compact storage
• One-click copy for a single value or any item in the list
• Cryptographically secure random generation

How to Generate a UUID

1. Choose a version: UUID v4 for fully random identifiers, or UUID v7 for time-ordered ones
2. Toggle UPPERCASE or no-hyphens if your system requires a specific format
3. Pick how many identifiers you need — 1, 5, 10, or 50
4. Copy a single value or any item from the generated list

UUID Version Guide

UUID Best Practices

Use UUID v7 for database primary keys when you need identifiers that sort naturally by creation time, improving index performance.

Use UUID v4 when you need identifiers with no discoverable pattern, such as public-facing tokens or resource IDs.

Store UUIDs in their native binary or standard 36-character format rather than inventing custom encodings, to stay compatible with databases and libraries.

Common UUID Mistakes to Avoid

Avoid using sequential integers where a UUID is expected — this can leak information about record counts and creation order.

Avoid mixing UUID versions inconsistently across a system, which can complicate sorting and debugging.

Avoid assuming UUIDs are cryptographically secret — UUID v4 is unique, but it is not a substitute for a proper access token or secret key.

Common Use Cases