UUID v4 Generator
Generate cryptographically random UUID v4 values, one or up to 100 at once, with uppercase and no-hyphen format options.
How it works
- Set how many you need (1-100) and toggle uppercase or hyphens
- A fresh set generates instantly — no page refresh
- Copy the whole list or download it as a .txt file
Frequently asked questions
Is a UUID the same as a GUID?
Effectively yes — UUID is the standard term, GUID is Microsoft's name for the same concept.
Can UUID v4 values collide?
In theory, but the odds are astronomically small (about 1 in 2^122), so it's ignored in practice.
How many can I generate at once?
Up to 100 per batch. Change the count and a new batch generates immediately.
Can I get UUIDs without hyphens or in uppercase?
Yes — both are toggles, and they apply instantly to whatever you've already generated without creating new values.
Related tools
From the blog
Update history
- 2026-09-03 Bounded numeric fields are now sliders instead of number inputs.
- 2026-08-30 Added: a cover image — used as the card thumbnail, social share image, and blog title image.
- 2026-08-29 Fixed: Embed button now works (it silently did nothing before — Astro module scripts made document.currentScript unreliable) and the generated iframe snippet points at the correct /embed/{category}/{slug} URL instead of a 404.
- 2026-08-28 Launched: instant UUID v4 generator, single or bulk (up to 100), with uppercase/hyphen format options — no page refresh to regenerate.