UUID/GUID Generator
Generate UUIDs v1 and v4 quickly and securely. Ideal for databases, APIs and testing.
UUID Generator Features
✨ UUID v4 Generation
Generate completely random and cryptographically secure UUID v4 using the native crypto.randomUUID() API. Ideal for unique identifiers without external dependencies.
🕐 UUID v1 Generation
Generate timestamp-based UUID v1 with simulated MAC address. Enables chronological sorting and creation date extraction. Perfect for logs and auditing.
✅ UUID Validation
Validate existing UUIDs and extract information like version, variant and timestamp (for v1). Automatically detects format and provides detailed feedback.
⚡ Bulk Generation
Generate up to 1000 UUIDs at once. Perfect for populating databases, creating test data or quickly generating batches of unique identifiers.
🎨 Custom Formatting
Choose between different formats: with or without hyphens, uppercase/lowercase, with braces or parentheses. Adapt UUIDs to any need.
🔒 100% Secure & Offline
All processing is done locally in your browser. Your UUIDs never leave your device. Works offline after initial loading.
How to Use the UUID Generator
Choose the version
Select between UUID v4 (random) or v1 (timestamp) using the tabs at the top of the tool.
Configure the options
Set the quantity (1-1000), format (with/without hyphens), case (upper/lowercase) and enable auto-copy if desired.
Generate and copy
Click "Generate UUIDs" and use the copy, copy all or download as .txt buttons.
Frequently Asked Questions about UUID
What is UUID and what is it used for?
UUID (Universally Unique Identifier) or GUID (Globally Unique Identifier) is a 128-bit unique identifier used to uniquely identify information in distributed systems, like databases, APIs, testing and microservices.
What's the difference between UUID v1 and v4?
UUID v4 is completely random and cryptographically secure, recommended for most cases. UUID v1 is based on timestamp and MAC address, enabling chronological sorting and date extraction.
Are UUIDs really unique?
The collision probability in UUID v4 is astronomically low (1 in 2^122). You would need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of 1 collision.
Can I use UUIDs as primary key?
Yes! UUIDs are excellent for primary keys in distributed systems, as they can be generated without central coordination. However, they take more space (16 bytes vs 4-8 bytes for integers).
Is this tool secure?
Yes, it's completely secure. We use crypto.randomUUID(), the browser's native API. All processing is local, no data is sent to servers and it works offline.