UUID Generator

Generate Unique Identifiers in Seconds

Need a reliable unique ID for a database row, an API resource, a test fixture, or a file name? This free UUID generator creates standards-compliant UUID v4 and UUID v7 values directly in your browser. Choose your preferred version, pick a format, set the batch count, and copy the results instantly.

What Is a UUID?

A UUID is a 128-bit identifier written as 32 hexadecimal characters split into five groups separated by hyphens. The canonical form looks like 550e8400-e29b-41d4-a716-446655440000. Because the namespace is so large, multiple computers can create UUIDs independently and still almost never produce the same value.

UUIDs are widely supported by databases, programming languages, and operating systems. PostgreSQL, MySQL, MongoDB, SQL Server, Python, Node.js, Java, and Go all have built-in or one-line ways to generate them. That portability makes them a safe default when you are not sure where an identifier will travel.

How to Use This Tool

1. Select a version: v4 for pure randomness, v7 for time-ordered values.
2. Pick a format: standard with dashes, compact without dashes, or URL-safe.
3. Set the count: generate one identifier or up to fifty at once.
4. Click Generate and copy individual values or the entire batch.

Common Use Cases

• Database primary keys in distributed systems.
• REST API resource identifiers exposed in URLs.
• Session, correlation, or request IDs for observability.
• Temporary file names, upload keys, and batch job labels.
• Test data and mock records that need realistic-looking IDs.

Worked Example: Database Primary Key

Imagine you are building a multi-tenant notes app. Users create notes from web and mobile clients, and you want to avoid a central ID counter. By assigning each note a UUID v7 primary key, you keep keys unique across clients while enjoying roughly chronological ordering in your index. A generated key might look like 0190a1b2-c3d4-7e56-8f90-1234567890ab. Because the leading bits encode the creation timestamp, range queries by time become much cheaper than with fully random v4 keys.

Why Use This Online UUID Generator?

Unlike command-line tools or library calls, this generator lets you quickly produce a batch of values, compare v4 and v7 side by side, and copy them in the exact format your project needs. Everything happens locally in your browser, so identifiers are never sent to a server. Whether you are debugging an API, seeding test data, or assigning IDs in a no-code workflow, the tool is ready without any setup.

Tips for Choosing a Version

• Use v4 when you need simple randomness and do not rely on sort order.
• Use v7 for new projects where database write locality and time sorting matter.
• Prefer compact format when dashes waste space in logs or compact storage.
• Prefer URL-safe format when embedding IDs in URLs or filenames.
• Keep a standard format when exchanging data with systems that expect the canonical 8-4-4-4-12 shape.