A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across all systems and time. It's commonly used for database primary keys, session IDs, file names, and API references. The most common format is UUID v4, which uses random numbers.

What is the difference between UUID and GUID?

UUID and GUID are essentially the same thing. UUID (Universally Unique Identifier) is the standard term used in most programming languages and systems, while GUID (Globally Unique Identifier) is the term Microsoft uses. Both follow the same format and specification.

Is UUID v4 truly random?

Yes, UUID v4 is generated using random or pseudo-random numbers. Our generator uses the browser's cryptographic API (crypto.getRandomValues) which provides cryptographically secure random numbers, making the UUIDs suitable for security-sensitive applications.

Can two UUIDs be the same?

While theoretically possible, the probability of generating two identical UUIDs is astronomically low (about 1 in 2^122). For practical purposes, UUID collisions are considered impossible and you can safely use them as unique identifiers.

How many UUIDs can I generate at once?

Our tool supports bulk generation of up to 100 UUIDs at once. Simply enter the desired count and click the bulk generate button. All UUIDs can be copied to your clipboard with one click.

UUID Generator

Generate random UUIDs (v4) instantly. This free online UUID/GUID generator creates unique identifiers for your databases, APIs, and applications.

Click "Generate" to create a UUID

Bulk Generation

Count (1-100) Generate multiple UUIDs

Validate UUID

Enter UUID to validate Check if a UUID is valid

How to Use

Generate a single UUID: Click the "Generate UUID" button to create a new random UUID (v4).
Copy to clipboard: Click "Copy" to copy the UUID to your clipboard for easy pasting.
Bulk generation: Enter a count (1-100) and click "Generate Bulk" to create multiple UUIDs at once.
Validate: Paste any UUID in the validator to check if it's properly formatted.

What is a UUID?

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit identifier that is practically unique across all systems and time. UUIDs are formatted as 32 hexadecimal digits displayed in five groups separated by hyphens, like this:


          550e8400-e29b-41d4-a716-446655440000

The format follows the pattern: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx, where M indicates the UUID version (4 for random) and N indicates the variant.

Features

Cryptographically Secure - Uses browser's crypto API for true randomness
Bulk Generation - Generate up to 100 UUIDs at once
UUID Validation - Verify any UUID format and version
One-Click Copy - Instantly copy single or multiple UUIDs
Works Offline - All processing happens in your browser
Privacy First - No data is sent to any server

Frequently Asked Questions

A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across all systems and time. It's commonly used for database primary keys, session IDs, file names, and API references. The most common format is UUID v4, which uses random numbers.
UUID and GUID are essentially the same thing. UUID (Universally Unique Identifier) is the standard term used in most programming languages and systems, while GUID (Globally Unique Identifier) is the term Microsoft uses. Both follow the same format and specification.
Yes, UUID v4 is generated using random or pseudo-random numbers. Our generator uses the browser's cryptographic API (crypto.getRandomValues) which provides cryptographically secure random numbers, making the UUIDs suitable for security-sensitive applications.
While theoretically possible, the probability of generating two identical UUIDs is astronomically low (about 1 in 2^122). For practical purposes, UUID collisions are considered impossible and you can safely use them as unique identifiers.
Our tool supports bulk generation of up to 100 UUIDs at once. Simply enter the desired count and click the bulk generate button. All UUIDs can be copied to your clipboard with one click.