Random UUID Generator

Why use this tool?

UUIDs are used throughout software development to uniquely identify records, sessions, and objects without needing a central database to assign IDs. This tool generates standard, RFC 4122-compliant version 4 UUIDs using your browser's cryptographically secure random number generator.

Everything happens locally in your browser, no UUIDs are logged or sent to a server.

UUID v4 vs UUID v7, which should you use?

UUID v4 is fully random: 122 bits of randomness make collisions practically impossible, and it reveals nothing about when or where it was created. It remains the default choice for most applications, API keys, and session identifiers.

UUID v7 is the newer standard (RFC 9562). It starts with a millisecond timestamp followed by random bits, which means v7 UUIDs sort naturally by creation time. That makes them ideal as database primary keys, inserts stay ordered, which keeps indexes fast. If you're building a new system with UUID keys in PostgreSQL, MySQL, or MongoDB, v7 is usually the better pick; use v4 when you don't want IDs to leak creation time.

UUID vs GUID, what's the difference?

Nothing, in practice. GUID (Globally Unique Identifier) is simply Microsoft's name for a UUID, used across Windows, .NET, and SQL Server. The format is identical, 32 hexadecimal digits in five groups, so every UUID this generator creates is also a valid GUID. If a tool or database asks for a GUID, you can use these values directly.

Generate UUIDs in Python, JavaScript, and Java

Need UUIDs in code instead? Every major language has a built-in way to create them:

Python UUID generator:

import uuid

print(uuid.uuid4())   # random v4 UUID

JavaScript UUID generator:

crypto.randomUUID();   // v4, built into modern browsers & Node.js

Java UUID generator:

import java.util.UUID;

UUID id = UUID.randomUUID();   // random v4 UUID

For quick one-off IDs, test data, or filling a spreadsheet, the online generator above is faster than opening a terminal.

How to use it

1. Adjust the quantity slider for how many UUIDs you need.
2. Click Generate UUID to create them instantly.
3. Use Copy all to grab the full list at once.

What is a UUID?+

A UUID (Universally Unique Identifier) is a 128-bit identifier, typically shown as 32 hexadecimal characters split into 5 groups, used to uniquely identify data without a central authority assigning them.

What UUID version does this generate?+

This tool generates version 4 (random) UUIDs, the most commonly used format, which relies on random numbers rather than timestamps or hardware addresses.

Is this UUID generator cryptographically secure?+

Yes, it uses your browser's built-in crypto.getRandomValues() function, a cryptographically secure random number generator, not a weak Math.random() implementation.

What is the difference between UUID v4 and v7?+

UUID v4 is fully random, while UUID v7 begins with a timestamp so values sort by creation time. v7 is ideal for database primary keys; v4 is best when IDs should reveal nothing about when they were created. This tool generates both.

Is a GUID the same as a UUID?+

Yes. GUID is Microsoft's term for a UUID, the format is identical. Any UUID generated here works wherever a GUID is required, including .NET and SQL Server.

Can I generate shorter unique IDs?+

UUIDs are always 36 characters with hyphens. Enable the "Remove hyphens" option to get a more compact 32-character version, the shortest form that remains a standard UUID.

Can I use this for Java, Python, or JavaScript projects?+

Yes, UUIDs generated here are standard RFC 4122 version 4 UUIDs and work as unique identifiers in any language or database, including Java, Python, and JavaScript applications.