UUID Generator
Generate RFC 4122 compliant v1 (time-based) and v4 (random) UUIDs for database primary keys and unique identifiers
UUID Generator
Generate unique identifiers (v1 & v4)
About UUIDs
UUIDs (Universally Unique Identifiers) are 128-bit identifiers standardized by RFC 4122 that are designed to be unique across all devices globally without requiring a central registration authority.
Common UUID versions and their characteristics:
- UUID v1: Time-based version that includes the MAC address of the computer that generated it. This provides uniqueness but can expose information about the generating system.
- UUID v4: Random version that uses random or pseudo-random numbers. This is the most commonly used version for most applications.
This tool generates UUIDs client-side using JavaScript. For production applications, consider using RFC 4122 compliant libraries specific to your backend or frontend framework.
UUID Format Examples
UUIDs follow a standardized format defined in RFC 4122. They consist of 32 hexadecimal digits displayed in 5 groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters (including hyphens).
| UUID Version | Example | Use Case |
|---|---|---|
| Version 4 (Random) | 123e4567-e89b-12d3-a456-426614174000 | Database primary keys, Any application requiring unique IDs |
| Version 1 (Time-based) | 4afs35c9-45fd-11ec-81d3-0242ac130003 | Logging, Time-sequenced events |
UUID in Different Programming Languages
Here are examples of how to generate UUIDs in common programming languages:
JavaScript/Node.js:
import { v4 as uuidv4 } from 'uuid';
const id = uuidv4(); // ⇨ '9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d'
Python:
import uuid
id = uuid.uuid4() # ⇨ UUID('9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d')
Java:
import java.util.UUID;
UUID uuid = UUID.randomUUID(); // ⇨ 9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d
DevToolCafe's free online UUID generator is the fastest way to create RFC 4122 compliant unique identifiers. Generate UUID v1 (time-based) and UUID v4 (random) instantly in your browser. Our client-side UUID generator ensures complete privacy — no data is sent to any server. Whether you need a single UUID for testing or bulk UUIDs for database seeding, this tool provides instant, secure, and reliable unique identifier generation for developers, database administrators, and software engineers.
What is a UUID?
A UUID (Universally Unique Identifier), also known as GUID (Globally Unique Identifier), is a 128-bit identifier standardized by RFC 4122. UUIDs are designed to be unique across all devices and time without requiring a central registration authority. They're formatted as 32 hexadecimal digits displayed in 5 groups separated by hyphens (8-4-4-4-12), totaling 36 characters. UUIDs are essential for distributed systems, database primary keys, session tokens, and any scenario requiring globally unique identifiers.
Why Use Our UUID Generator?
100% Client-Side Generation
All UUIDs are generated locally in your browser using cryptographically secure random number generation. No server requests, no data collection, complete privacy.
RFC 4122 Compliant
Generate standards-compliant UUIDs that work with any system expecting proper UUID format. Compatible with databases, APIs, and all major programming languages.
Bulk Generation Support
Generate multiple UUIDs at once for database seeding, testing, or batch operations. Copy all generated UUIDs with a single click.
Multiple UUID Versions
Choose between UUID v4 (random) for most use cases or UUID v1 (time-based) when you need chronological ordering or timestamp information.
How to Generate UUIDs
Select UUID Version
Choose UUID v4 for random generation (recommended for most cases) or UUID v1 for time-based identifiers with embedded timestamps.
Set Quantity
Specify how many UUIDs you need. Generate a single UUID or batch generate up to 100 UUIDs at once.
Generate
Click the Generate button to instantly create your UUIDs. Generation happens locally in your browser.
Copy and Use
Click on any UUID to copy it individually, or use 'Copy All' to copy all generated UUIDs to your clipboard.
Frequently Asked Questions
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