Free Online UUID Generator Tool
Generate UUIDs/GUIDs in versions 1 (time-based), 4 (random), and 5 (SHA-1 namespace). Create single or bulk unique identifiers for databases, API keys, session tokens, and distributed systems. Customize case, hyphens, and quantity. 100% client-side.
How to Use the UUID Generator Tool
Choose UUID Version
Select from UUID v1 (time-based), v4 (random), or v5 (SHA-1 namespace + name). Each version suits different use cases.
Configure Options
Set the number of UUIDs to generate (1-1000), choose uppercase or lowercase, and toggle hyphens on/off.
Copy or Download
Copy all generated UUIDs to your clipboard, or copy them individually. Ready for use in your databases, code, or configuration.
Powerful UUID Generator Features
Everything you need to generate UUIDs for any purpose — all in one free tool.
UUID v4 (Random)
Generate cryptographically strong random UUIDs using crypto.randomUUID(). Perfect for general-purpose unique identifiers.
UUID v1 (Time-Based)
Generate time-based UUIDs incorporating timestamp and node information. Useful for chronological sorting and distributed systems.
UUID v5 (SHA-1 Namespace)
Generate deterministic UUIDs from a namespace UUID and a name string using SHA-1 hashing. Consistent IDs from the same inputs.
Bulk Generation
Generate 1 to 1000 UUIDs at once. Perfect for populating databases, seeding test data, and bulk ID creation.
Customizable Format
Toggle hyphens on/off, switch between uppercase and lowercase. Adapt the output to your specific requirements.
Copy to Clipboard
Copy all generated UUIDs to your clipboard with a single click, or copy individual UUIDs.
Live Preview
See generated UUIDs update instantly as you change version, quantity, or formatting options.
100% Client-Side
All UUID generation happens in your browser using the Web Crypto API. No server uploads, no data logging.
Why Use Our UUID Generator Tool
The fastest, most flexible way to generate UUIDs online. No sign-up, no limits, no data leaving your browser.
100% Free
No hidden fees, no premium plans, no usage limits. Generate as many UUIDs as you need, whenever you need.
Privacy First
All generation happens in your browser using the Web Crypto API. Your data never leaves your device.
Multiple Versions
Supports UUID v1 (time-based), v4 (random), and v5 (namespace + name). Choose the right version for your use case.
Developer-Friendly
Perfect for generating database primary keys, API keys, session tokens, correlation IDs, and unique identifiers for distributed systems.
Key Highlights
- No sign-up or registration required
- Processes everything in your browser — zero server uploads
- Supports UUID v1, v4, and v5
- Bulk generation up to 1000 UUIDs at once
- Customizable format (case, hyphens)
- Works on any device — desktop, tablet, or mobile
Frequently asked questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are standardized by RFC 4122 and are globally unique across space and time, making them ideal for distributed systems, database keys, and API identifiers.
Is this UUID generator really free?
Yes, completely free. There are no hidden charges, no usage limits, and no premium features locked behind a paywall. Generate as many UUIDs as you need.
What's the difference between UUID versions?
UUID v1 is time-based, incorporating a timestamp and node ID — useful for chronological ordering. UUID v4 is randomly generated — best for general-purpose unique IDs. UUID v5 is name-based, using SHA-1 hashing of a namespace UUID and a name — produces the same UUID for the same inputs, ideal for deterministic ID generation.
Are the UUIDs truly random?
UUID v4 uses crypto.getRandomValues() which provides cryptographically strong random numbers. This ensures the generated UUIDs are suitable for security-sensitive applications like session tokens and API keys.
Can I remove hyphens from UUIDs?
Yes! Toggle the 'Hyphens' option to generate UUIDs without dashes (e.g., 550e8400e29b41d4a716446655440000 instead of 550e8400-e29b-41d4-a716-446655440000).
Can I generate uppercase UUIDs?
Yes! Toggle the 'Uppercase' option to generate UUIDs in uppercase letters (e.g., 550E8400-E29B-41D4-A716-446655440000).
What is UUID v5 used for?
UUID v5 is used when you need deterministic UUIDs — the same namespace + name always produces the same UUID. Common use cases include generating consistent IDs for resources based on their names, deduplication, and reference data.
Do I need to install anything?
No installation required. The UUID generator works entirely in your web browser. Just open the page and start generating. No downloads, no plugins, no setup.
Can I use this on my phone?
Yes, the tool is fully responsive and works on all devices — desktops, tablets, and smartphones. The interface adapts to your screen size for comfortable use anywhere.