UUID v4 (Version 4) is a universally unique identifier generated from random numbers. It consists of 32 hexadecimal digits displayed in 5 groups separated by hyphens (xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx).

Are these UUIDs cryptographically secure?

Yes! Our UUID generator uses the Web Crypto API to generate truly random bytes, ensuring each UUID is unique and unpredictable.

Can I generate multiple UUIDs at once?

Yes! You can generate up to 10,000 UUIDs in a single batch, perfect for bulk data seeding or testing.

What's 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 of UUID. Our tool generates standard UUID v4 format.

Should I use uppercase or lowercase?

UUIDs are case-insensitive for comparison, but some systems prefer lowercase. Our tool lets you choose either format.

Can I remove hyphens from UUIDs?

Yes! Disable the hyphens option to generate compact 32-character UUIDs without dashes. Some APIs prefer this format.

What can I use UUIDs for?

Database primary keys, API request IDs, session identifiers, distributed system tracing, file names, or any situation requiring globally unique identifiers.

Random UUID/GUID Generator - Generate Version 4 UUIDs

About this tool

This tool uses a cryptographically secure pseudo-random number generator (CSPRNG) to ensure fairness and security.

Tip: press Space to generate again.

About Random UUID Generator

Generate cryptographically secure UUID v4 identifiers. Create single or batch UUIDs with uppercase/lowercase and hyphen formatting. Perfect for database IDs, API keys, and unique tokens.

How to Use Random UUID Generator

1Choose uppercase or lowercase format
2Enable or disable hyphens
3Set how many UUIDs to generate
4Click 'Generate UUID'
5Copy all or individual UUIDs

Features

UUID v4 format
Uppercase/lowercase option
With/without hyphens
Batch generation
CSPRNG security
No collisions

Frequently Asked Questions

What is a UUID v4?: UUID v4 (Version 4) is a universally unique identifier generated from random numbers. It consists of 32 hexadecimal digits displayed in 5 groups separated by hyphens (xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx).
Are these UUIDs cryptographically secure?: Yes! Our UUID generator uses the Web Crypto API to generate truly random bytes, ensuring each UUID is unique and unpredictable.
Can I generate multiple UUIDs at once?: Yes! You can generate up to 10,000 UUIDs in a single batch, perfect for bulk data seeding or testing.
What's 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 of UUID. Our tool generates standard UUID v4 format.
Should I use uppercase or lowercase?: UUIDs are case-insensitive for comparison, but some systems prefer lowercase. Our tool lets you choose either format.
Can I remove hyphens from UUIDs?: Yes! Disable the hyphens option to generate compact 32-character UUIDs without dashes. Some APIs prefer this format.
What can I use UUIDs for?: Database primary keys, API request IDs, session identifiers, distributed system tracing, file names, or any situation requiring globally unique identifiers.

Related Tools

Random Number Generator 1-10

Generate a truly random number between 1 and 10 instantly. Perfect for quick decisions, games, and giveaways. Free, secure, with no ads.

Random Number Generator 1-100

Generate a random number between 1 and 100. Fast, secure, and fair random number picker for games, contests, and decisions. No registration required.

Random Number Generator 1-1000

Generate a random number between 1 and 1000. Secure, fast, and fair random number generator perfect for large range selections, contests, and statistical sampling. Use custom range settings.

Random Number Generator 1-10000

Generate a random number between 1 and 10,000. Secure random number generator for large-scale selections, ID generation, and statistical purposes.

Secure & Private

All generation happens locally in your browser using Web Crypto API (CSPRNG). Your data never leaves your device. No tracking, no storage, complete privacy.