🔢 UUID/GUID Generator

Generate unique identifiers (UUIDs/GUIDs) instantly. Supports UUID v4 and v7 (new 2024 standard). Bulk generation up to 1000 IDs at once.

⚙️ Configuration

🔍 What is a UUID?

UUID (Universally Unique Identifier) or GUID (Globally Unique Identifier)is a 128-bit identifier that's practically guaranteed to be unique.

f47ac10b-58cc-4372-a567-0e02b2c3d479

Format: 8-4-4-4-12 hexadecimal digits (32 characters + 4 hyphens)

📊 UUID v4 vs v7

UUID v4 (Random)

  • ✅ Most common version
  • ✅ Fully random
  • ❌ Not sortable
  • 📅 Standard since 2005

UUID v7 (Timestamp)NEW!

  • ✅ Timestamp-based
  • ✅ Sortable by creation time
  • ✅ Better database performance
  • 📅 New standard 2024

💼 Common Uses

  • 🗄️Database IDs: Primary keys for records
  • 🔑API Keys: Unique identifiers for users/apps
  • 📁File Names: Unique file identifiers
  • 🔗Session IDs: User session tracking
  • 📦Object IDs: Distributed systems

💻 Code Examples

JavaScript

// UUID v4
crypto.randomUUID();

// UUID v7 (custom)
function uuidv7() {
  // timestamp + random
}

Python

import uuid
import { createSoftwareApplicationSchema, createFAQSchema, createHowToSchema, toolConfigs } from '../utils/structuredDataTemplates';
import RelatedTools from '../components/shared/relatedTools';
import AdSenseSection from '../components/shared/adSense';
import SecurityNotice from '../components/shared/securityNotice';
uuid.uuid4()  # v4
uuid.uuid7()  # v7 (Python 3.12+)

🎯 Fun Facts

♾️

Practically Infinite

2^122 ≈ 5.3 × 10^36 possible UUIDs

🎲

Collision Chance

Need 1 billion to have 0.00000001% chance

⚡

Fast Generation

Can generate millions per second

🆔 Understanding UUIDs (Universally Unique Identifiers)

A UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify information in computer systems. UUIDs are designed to be unique across time and space without requiring a central registration authority, making them ideal for distributed systems where multiple parties need to generate unique identifiers independently.

UUIDs are represented as 32 hexadecimal digits, displayed in five groups separated by hyphens: 8-4-4-4-12, for a total of 36 characters (32 hexadecimal characters and 4 hyphens). For example: 550e8400-e29b-41d4-a716-446655440000. This format makes UUIDs easy to read, write, and transmit.

There are several versions of UUIDs, each using different methods to ensure uniqueness. UUID v4 (random UUIDs) is the most commonly used version. It generates identifiers using random or pseudo-random numbers, providing excellent uniqueness guarantees. The probability of generating duplicate UUIDs is astronomically low—you would need to generate approximately 2.71 quintillion UUIDs to have a 50% chance of a single collision.

UUID v7 is a newer standard (introduced in 2024) that includes a timestamp component, making UUIDs sortable by creation time. This is particularly useful for database indexing and querying, as UUIDs can be ordered chronologically. UUID v7 maintains uniqueness while providing better database performance compared to random UUIDs.

UUIDs are widely used in software development for primary keys in databases, session identifiers, transaction IDs, file names, API request IDs, and any scenario where you need a unique identifier that doesn't reveal information about the object it identifies. They're especially valuable in distributed systems, microservices architectures, and cloud applications where multiple systems need to generate unique identifiers without coordination.

Our UUID generator uses cryptographically secure random number generation to create truly unique identifiers. All UUID generation happens . in your browser, ensuring your identifiers are never transmitted or stored on our servers. This is particularly important for security-sensitive applications where identifier generation must remain private.

📖 How to Use This UUID Generator

Generating UUIDs with our tool is simple and flexible:

  1. Choose UUID Version: Select between UUID v4 (random) or UUID v7 (timestamp-based). UUID v4 is recommended for most use cases, while UUID v7 is better for database applications where sortability is important.
  2. Set Quantity: Choose how many UUIDs you want to generate (1 to 100). This is useful for bulk generation when you need multiple unique identifiers.
  3. Generate UUIDs: Click the "Generate UUIDs" button to create your unique identifiers. Each UUID is generated using cryptographically secure random number generation.
  4. Copy UUIDs: Click the copy button next to any UUID to copy it to your clipboard. You can also copy all UUIDs at once using the "Copy All" button.
  5. Use in Your Application: Paste the UUIDs into your code, database, configuration files, or wherever you need unique identifiers.

Pro Tip: For database primary keys, consider UUID v7 if your database benefits from sequential IDs. For API request IDs, session tokens, or any scenario where randomness is preferred, use UUID v4.

💼 Common Use Cases

Database Primary Keys

UUIDs are commonly used as primary keys in databases, especially in distributed systems where auto-incrementing integers can cause conflicts. UUIDs allow multiple database servers to generate unique IDs without coordination, making them ideal for sharded databases and microservices architectures.

API Request IDs

UUIDs serve as unique identifiers for API requests, making it easy to track, log, and debug requests across distributed systems. When a request fails, the UUID can be used to trace the request through multiple services and identify where the failure occurred.

Session Identifiers

Web applications use UUIDs as session identifiers to track user sessions. UUIDs provide better security than sequential IDs because they're unpredictable and don't reveal information about the number of active sessions or system usage patterns.

File and Resource Naming

UUIDs are used to name files, resources, and objects in storage systems. This prevents naming conflicts and ensures that files can be stored in distributed systems without coordination. UUIDs also don't reveal information about file contents or creation order.

Distributed System Coordination

In microservices and distributed systems, UUIDs allow different services to generate unique identifiers independently without needing a central coordination service. This improves scalability and reduces system complexity.

✅ UUID Best Practices

1. Choose the Right Version

Use UUID v4 for most applications where randomness and uniqueness are the primary concerns. Use UUID v7 when you need sortable identifiers for better database indexing performance, especially in time-series data or when chronological ordering is important.

2. Use Cryptographically Secure Generation

Always use cryptographically secure random number generators for UUID generation, especially for security-sensitive applications. Weak random number generators can lead to predictable UUIDs, which can be exploited by attackers.

3. Consider Database Performance

UUIDs are larger than integer IDs (16 bytes vs 4-8 bytes), which can impact database performance and storage. For high-performance applications with millions of records, consider the trade-offs between UUIDs and sequential IDs. UUID v7 can help mitigate some performance issues through better indexing.

4. Don't Use UUIDs for Security

While UUIDs are unique and unpredictable, they're not designed for security purposes. Don't use UUIDs as passwords, API keys, or authentication tokens. Use proper cryptographic keys and tokens designed for security applications.

5. Store as Binary When Possible

UUIDs can be stored as 16-byte binary values instead of 36-character strings, reducing storage requirements by more than half. Most databases support binary UUID storage, which improves both storage efficiency and query performance.

❓Frequently Asked Questions - UUID Generator

Guide

How to use this tool well

UUIDs identify rows, sessions, and objects in distributed systems. Version 4 (random) is the default for new IDs; version 1 includes MAC/time components you may not want exposed.

Runs in your browserInputs are processed on your device. We do not receive generated secrets from this tool.

Version 4 vs version 1

UUID v4 uses random bits — low collision risk for billions of records. UUID v1 embeds timestamp and node data; fine internally, avoid exposing if privacy matters.

UUID v7 (time-ordered) is gaining adoption for database indexing; use it when your stack supports sorted inserts.

Common questions

Are UUIDs secret session tokens?
No. They are identifiers, not authorization. Use cryptographically random session IDs with proper server-side validation.

Editorial standards: how we write and review guides.

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