UUID Generator
Generate RFC-compatible version 4 UUIDs locally, entirely in your browser.
Processed locally — your files remain on this device
Generates version 4 (random) UUIDs using your browser's built-in secure random number generator.
Processing… this happens entirely in your browser.
Result
Completed Completed with a noteHow it works
- Choose how many UUIDs you need.
- Click Generate.
- Copy all of them to your clipboard at once.
Supported formats & limitations
- Input
A quantity (1–50) — nothing else. - Output
Version 4 (random) UUIDs, one per line.
- Generates up to 50 UUIDs at a time.
- Only version 4 (random) UUIDs are supported — not version 1 (time-based) or other variants.
Frequently asked questions
What is a UUID used for? ›
A universally unique identifier is commonly used as a database key, request ID, or unique filename where collisions must be extremely unlikely.
Are these UUIDs sent anywhere? ›
No, they’re generated entirely in your browser using the Web Crypto API and never leave your device.
Can two generated UUIDs ever collide? ›
It’s theoretically possible but practically negligible — version 4 UUIDs have 122 random bits, making collisions astronomically unlikely.
Troubleshooting
Why is the quantity capped at 50? ›
It’s a simple usability limit for the on-screen list — generate multiple batches if you need more.
Why did copy all not work? ›
Clipboard access can be blocked by browser permissions or an insecure (non-HTTPS) context — select and copy the list manually as a fallback.
Something not working as expected? Send feedback about this tool.