What is the difference between UUID and GUID?

UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are essentially the same thing. GUID is Microsoft's implementation and terminology for UUID. Both follow the same RFC 4122 standard and produce identical 128-bit identifiers in the format xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.

What is UUID v4 and how is it generated?

UUID v4 is a randomly generated UUID using cryptographically strong random numbers. It's the most commonly used UUID version because it doesn't require any central coordination or machine-specific information. Our generator uses the Web Crypto API to ensure truly random, secure UUIDs.

How many UUIDs can I generate at once?

Our bulk UUID generator allows you to create up to 100 UUIDs in a single click. This is useful for database seeding, testing, or any scenario where you need multiple unique identifiers quickly.

Are the generated UUIDs truly unique?

Yes, UUID v4 uses 122 random bits, providing 5.3 x 10^36 possible combinations. The probability of generating duplicate UUIDs is astronomically low - you would need to generate 1 billion UUIDs per second for about 85 years to have a 50% chance of a single collision.

What UUID formats are available?

Our generator supports multiple formats: standard format with hyphens (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx), without hyphens for compact storage, uppercase for systems that require it, and lowercase (default). You can also copy UUIDs as JSON arrays or newline-separated lists.

How do I validate an existing UUID?

Our tool includes a UUID validator that checks if a string is a valid UUID format. Simply paste any UUID and the tool will verify its structure matches the standard UUID pattern and identify the UUID version (v1, v4, etc.).

Is this UUID generator secure and private?

Yes, all UUIDs are generated entirely in your browser using the Web Crypto API. No data is sent to any server, no UUIDs are logged or stored, and you can use this tool offline. Your generated identifiers remain completely private.

uuid

UUID Generator - Random UUID v4 & GUID Creator

Generate random UUIDs (v4), validate existing UUIDs, and bulk generate up to 100 unique identifiers at once. Multiple format options including with/without hyphens, uppercase, and lowercase. Free, fast, and private.

Count

Format

Generated UUIDs (v4)

e55f0601-e829-449a-8f65-da5bdbb548da

Validate UUID

Key Features

Generate UUIDs

Cryptographically secure random UUIDs
UUID v4 compliant (RFC 4122)
Single or bulk generation
Up to 100 UUIDs at once
Instant generation

Format Options

Standard format with hyphens
Compact format without hyphens
Uppercase or lowercase
Copy as JSON array
Newline-separated list

Validate & Verify

UUID format validation
Version detection (v1, v4, etc.)
Real-time validation
Clear error messages
100% browser-based

How to Use This Tool

Choose Quantity

Select how many UUIDs you need - generate a single UUID or bulk create up to 100 at once

Generate

Click the Generate button to create random UUIDs using cryptographically secure randomness

Copy & Use

Copy your UUIDs in your preferred format - with or without hyphens, uppercase or lowercase

Frequently Asked Questions

A UUID (Universally Unique Identifier) is a 128-bit identifier that is globally unique. UUIDs are essential in distributed systems, databases, and APIs where you need unique identifiers without a central authority. They're commonly used for database primary keys, session tokens, file names, and tracking IDs.

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