CentralTools
100% Client-Side

Free Online UUID Generator

Generate random version 4 UUIDs (Universally Unique Identifiers) instantly.

How to Use Free Online UUID Generator

1

Select how many UUIDs you want to generate (1-100).

2

Click 'Generate UUIDs'.

3

Copy the list to your clipboard.

Why Use This Tool?

Standard Compliant

Generates RFC 4122 compliant v4 UUIDs.

Bulk Generation

Create up to 100 UUIDs at once.

Developer Ready

Perfect for database keys and unique IDs.

Free UUID/GUID Generator - Create Unique Identifiers Online

Generate cryptographically strong UUIDs instantly for databases, APIs, and distributed systems. Create single or bulk UUIDs in v4 (random) format perfect for primary keys, session tokens, and unique identifiers. All IDs generated client-side with zero server communication—completely private and secure.

Quick How-To Guide

  1. 1Set the quantity of UUIDs you need (1 for single use, up to 1000 for bulk)
  2. 2Choose your preferred format (standard hyphenated, uppercase, or compact)
  3. 3Click "Generate UUIDs" to create unique identifiers instantly
  4. 4Copy individual UUIDs for immediate use in your code
  5. 5Download all UUIDs as a text file for batch database imports

Why use our tool?

Cryptographically secure—uses Web Crypto API for strong randomness ensuring uniqueness
Bulk generation—create 1 to 1000 UUIDs at once for batch database operations
Multiple formats—output as uppercase, lowercase, or without hyphens
Collision-free guarantee—statistically zero chance of duplicate IDs across systems
Instant generation—create UUIDs in milliseconds without server delays
100% offline capable—all UUIDs generated locally in your browser

Frequently Asked Questions

Find answers to common questions about using our tool, its features, and how it handles your data privacy.

UUID v4 uses 122 random bits, providing 5.3×10³⁶ possible combinations. The probability of generating a duplicate is astronomically small—you could generate billions of UUIDs per second for millions of years before seeing a collision. In practical terms, UUIDs are guaranteed unique across all systems, databases, and time periods.
UUIDs are excellent for distributed databases, microservices, or when generating IDs client-side before server sync. They eliminate the need for centralized ID generation. However, they take more storage (128 bits vs 32-bit integers) and are non-sequential, which can affect index performance in some databases. For single-server apps with high write volumes, auto-incrementing integers may perform better.
Absolutely! All UUIDs generated are free for unlimited commercial and personal use. No attribution required, no licensing fees, no usage restrictions. Use them for user IDs, session tokens, API keys, file names, transaction IDs, or any other purpose.
UUID v4 generated with the Web Crypto API is cryptographically secure for session tokens and API keys when combined with proper security practices (HTTPS, expiration, secure storage). However, for high-security authentication, consider using specialized JWT libraries that add expiration metadata, signatures, and additional entropy.
Most languages have built-in UUID support. In JavaScript: use the string directly. In Python: import uuid; uuid.UUID("your-uuid-here"). In Java: UUID.fromString("your-uuid"). In C#: Guid.Parse("your-uuid"). Our tool outputs standard RFC 4122 format (8-4-4-4-12 hexadecimal), compatible with all major programming languages and databases.

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