UUID Generator

What is an UUID Generator?

Generate 128-bit Universally Unique Identifiers (UUID). Supports random RFC 4122 UUID v4 and modern time-ordered UUID v7 formats. Custom options for uppercase/lowercase and batch quantity.

Why Use This Tool?

Database Primary Keys: Generate unique, non-sequential UUID primary keys for SQL and NoSQL database records.
Distributed System Tracking: Assign unguessable correlation IDs to microservice API requests.
Time-Ordered Sorting (UUID v7): Use UUID v7 for database-friendly time-sorted primary keys.

How to Use

Select Version: UUID v4 (Random) or UUID v7 (Time-Ordered).
Set Batch Quantity (e.g. `10`).
Click Generate and copy formatted UUID string list.

Real Working Example

Input:

Version: UUID v4 (Random) | Quantity: 5

Output Result:

f47ac10b-58cc-4372-a567-0e02b2c3d479
8f93e62a-1b4d-4e92-9c3f-7a8b9c0d1e2f
3b2a1c0d-4e5f-4a6b-8c7d-9e0f1a2b3c4d
9d8c7b6a-5f4e-4d3c-2b1a-0f9e8d7c6b5a
1a2b3c4d-5e6f-4789-a0b1-c2d3e4f56789

Important Technical Details & Security Standards

RFC 4122 / RFC 9562 Specs: Complies with official IETF UUID standards (variant 10xx, version bits 4 or 7).
Web Crypto CSPRNG: Uses `crypto.getRandomValues()` for 122 bits of true random entropy in UUID v4.
Client-Side Engine: Fast in-browser bulk generation.

Related Security & Crypto Tools

ULID Generator: Generate lexicographically sortable ULIDs.
Token Generator: Generate random tokens.
Random Number Generator: Generate random numbers.

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number formatted as 32 hex digits in 5 groups (8-4-4-4-12).

What is the difference between UUID v4 and UUID v7?

UUID v4 is entirely random; UUID v7 embeds a Unix timestamp prefix, making it lexicographically sortable for database B-Tree indexing.

What is the probability of a UUID v4 collision?

Generating 1 billion UUIDs per second for 85 years yields a 50% probability of a single collision—practically impossible.

Is it free?

Yes, 100% free.

Are generated UUIDs stored anywhere?

No, all UUID generation runs 100% locally in your web browser.

Can I generate UUIDs in uppercase or lowercase?

Yes, toggle uppercase or lowercase format.