UUID Generator
Generate unique UUIDs (v4) instantly. Create single or bulk UUIDs with format options. Perfect for database IDs, API keys, and unique identifiers. Fast, secure, and works entirely in your browser.
Format Options
Generated UUIDs
0 UUIDsNo UUIDs generated yet
đź”’ Privacy: All UUIDs are generated in your browser using cryptographically secure random values. Nothing is sent to any server.
Embed This Tool
Add this tool to your website with customizable styling
How to Use
-
1
Set the quantity
Enter how many UUIDs you need (1-100). The tool generates 1 UUID by default when you load the page, ready to use immediately.
-
2
Choose your format
Select your preferred format: lowercase or UPPERCASE, and with or without hyphens. The most common format is lowercase with hyphens (e.g.,
550e8400-e29b-41d4-a716-446655440000). -
3
Generate UUIDs
Click "Generate New" to create fresh UUIDs with your chosen settings. The tool uses cryptographically secure random values, ensuring each UUID is truly unique.
-
4
Copy individual UUIDs
Click the copy icon next to any UUID to copy it to your clipboard. Perfect when you need just one specific UUID from a batch.
-
5
Copy all at once
When generating multiple UUIDs, use the "Copy All" button to copy the entire list (one UUID per line). Great for bulk imports or database seeding.
Frequently Asked Questions
What is a UUID and when should I use it?
A UUID (Universally Unique IDentifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are perfect for database primary keys, session IDs, API keys, file names, and any scenario where you need a unique identifier without a central authority. The probability of generating duplicate UUIDs is so low (1 in 2^122) that it's effectively zero. This tool generates UUID v4, which uses random numbers for maximum unpredictability.
What's the difference between UUID versions?
There are several UUID versions, but UUID v4 (what this tool generates) is the most common and recommended for general use. It's entirely random and doesn't contain any information about your system or timestamp. UUID v1 includes timestamp and MAC address (privacy concern). UUID v3/v5 are name-based (deterministic, same input = same UUID). UUID v4 is the best choice for most applications because it's simple, secure, and privacy-friendly.
Should I use hyphens or not?
With hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000) is the standard format and most widely supported. Use this format for databases, APIs, and most programming languages. Without hyphens (e.g., 550e8400e29b41d4a716446655440000) is more compact and sometimes required by specific systems or when you need to save space. Most databases and libraries accept both formats, but when in doubt, use the hyphenated version.
Are these UUIDs secure and truly unique?
Yes! This tool uses your browser's crypto.randomUUID() API, which generates cryptographically secure random UUIDs. All generation happens locally in your browser—nothing is sent to any server. While no system can guarantee 100% uniqueness, the probability of collision is astronomically low (about 1 in 5.3 × 10^36). You'd need to generate billions of UUIDs per second for many years to have even a tiny chance of a duplicate. For practical purposes, UUIDs are unique.