UUID Generator
The UUID Generator creates universally unique identifiers (RFC 4122 compliant) directly in your browser. Generate UUID version 4 (random) or version 1 (time-based) in batches of up to 500, with optional uppercase letters and curly braces. Powered by the Web Crypto API for cryptographically strong randomness, ensuring uniqueness even at scale. Perfect for database keys, distributed systems, file naming, test fixtures, and anywhere you need collision-free identifiers.
How to Use
To use the UUID Generator, simply open the tool page and interact with the controls in the panel above. The interactive panel handles input and produces instant results entirely in your browser — no signup, no upload. Use the Copy button when you want to transfer the output to your clipboard.
Key Features
- Runs in your browser — No data uploads or server roundtrips.
- Free & no signup — Use without registration or limits.
- Privacy first — Your input never leaves your device.
- Instant results — All processing is synchronous and local.
- Copy & download — Copy output or download to a file when supported.
Common Use Cases
This tool is useful for developers, designers, testers, students, and anyone who needs a quick, browser-based utility without installing software.
Tips & Tricks
Bookmark the tool for quick access during your workflow. Combine it with the related tools listed below for end-to-end productivity.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems without central coordination. RFC 4122 defines the formats.
What is the difference between v4 and v1?
Version 4 uses random numbers generated from cryptographically secure entropy. Version 1 uses the machine MAC address and current timestamp.
Are generated UUIDs unique?
Yes. UUID v4 has 122 bits of randomness, making collisions astronomically improbable.
Can I use these UUIDs commercially?
Absolutely. UUIDs are not owned or restricted. Use them for database keys, distributed systems, file naming, scratch files, etc.
Is my data sent to a server?
No. UUIDs are generated entirely in your browser using the Web Crypto API. Nothing is transmitted.