How to Generate UUIDs in Bulk (v4 Random) for Testing and Production
Free, step-by-step guide. No signup needed — everything runs in your browser.
1
Open the UUID Generator
Navigate to the tool. No signup, nothing to install.
2
Choose how many
Pick a count between 1 and 1000. Default is 1 for quick single-UUID needs.
3
Pick a format
Standard lowercase-hyphenated, uppercase, no-hyphens (32 hex chars), or wrapped in braces (Microsoft GUID style).
4
Generate and copy
Hit Generate, then click any individual UUID to copy it, or Copy All to grab the whole batch.
Tips for best results
- v4 UUIDs have 122 bits of entropy — collision-resistant enough for any practical use, including primary keys in distributed systems.
- In code, use crypto.randomUUID() directly — it is native, fast, and cryptographically secure. We use it under the hood.
- Microsoft’s GUID format is the same data as a UUID, just usually written with braces and uppercase: {XXXXXXXX-XXXX-...}.
- Avoid UUIDs as URL slugs unless you need opacity — they are long, ugly, and bad for SEO.
- If you need sequential UUIDs for database insert performance (v7), generate them server-side — v7 is not in the browser API yet.