Free UUID Generator – Generate UUIDs Online Instantly
Cryptographically secure UUIDs, generated in your browser.
ToolCraftr is a free online UUID generator that creates version 4 UUIDs directly in your browser. Unlike server-based tools, our UUID v4 generator runs entirely client-side, ensuring maximum privacy and instant generation. Perfect for developers, database administrators, and anyone needing unique identifiers.
Who is this UUID generator for?
Software Developers needing unique identifiers for database records, API keys, or session tokens.
Database Administrators generating primary keys for distributed database systems.
System Architects designing microservices that require globally unique identifiers.
QA Testers generating test data with unique identifiers for automation scripts.
Key Features
Everything you need from a modern UUID generator.
Instant Generation
Generate UUIDs in milliseconds. No server round trips, no waiting. All processing happens locally in your browser.
Cryptographically Secure
Uses the Web Crypto API for random number generation, meeting security standards for production use.
Bulk Generation
Generate up to 1000 UUIDs at once. Perfect for seeding databases or creating test datasets.
Custom Formatting
Toggle uppercase, remove hyphens, or use standard format. Export as text file with one click.
100% Client-Side
No server communication. Works offline after initial page load. Your data never leaves your device.
Zero Tracking
We don't log, store, or analyze your generated UUIDs. Complete privacy guaranteed.
What are UUIDs used for?
UUIDs (Universally Unique Identifiers) are 128-bit numbers used to identify information without requiring a central authority to coordinate uniqueness.
Our generator creates Version 4 UUIDs, which are randomly generated. The probability of collision is so low (1 in 2^122) that UUIDs can be generated independently across distributed systems without coordination.
Common use cases: database primary keys, session IDs, file names, API request IDs, and distributed system identifiers.
Common Questions
What is a UUID?
UUID stands for Universally Unique Identifier. It's a 128-bit number used to uniquely identify information in computer systems. The probability of generating duplicate UUIDs is extremely low, making them ideal for distributed systems.
Is the UUID generation cryptographically secure?
Yes. Our tool uses the Web Crypto API (crypto.randomUUID()) which generates cryptographically strong random values suitable for security-sensitive applications.
Can I generate multiple UUIDs at once?
Yes! You can generate up to 1000 UUIDs in a single batch. Use the quantity slider to select how many UUIDs you need, then click Generate.
Are my generated UUIDs stored or logged?
No. All UUID generation happens entirely in your browser using JavaScript. We do not store, log, or transmit any generated UUIDs to our servers.
Ready to generate UUIDs?
No sign-up, no installation. Start generating unique identifiers now.