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UUID Generator

Best free online UUID generator: v4, v7, bulk generation

Most UUID generator sites produce a single v4 UUID. MyDevTools UUID Generator lets you choose the version (v4, v7, ULID), generate in bulk, and stay inside a broader developer toolkit for API keys, hashing, QR codes, and other generator workflows.

Generate UUIDs

UUID v4 vs v7: which to generate

UUID v4 is fully random and works everywhere. UUID v7 is time-ordered, which makes it better for database primary keys where insert order matters for index performance.

  • UUID v4: stateless, random, maximum compatibility with existing systems.
  • UUID v7: time-ordered, better B-tree locality, recommended for new database schemas.
  • ULID: shorter, URL-safe, lexicographically sortable alternative to UUID.

Why use a toolkit instead of a single-purpose generator

After generating UUIDs you often need to build a request body, format JSON, or generate an API key — all in the same session.

  • Generate UUIDs and API keys from the same generator section.
  • Paste generated IDs into the API client or JSON formatter without switching tabs.
  • Use mock data generator when you need multiple IDs alongside other test fields.

Verdict

Any UUID generator produces valid v4 UUIDs. Choose one that integrates into your broader workflow.

  • Best single v4: any online generator.
  • Best version choice + bulk + context: MyDevTools.
  • Best open-source/self-hosted: MyDevTools.

Common comparison questions

Is it safe to use an online UUID generator?

UUID v4 generators use cryptographically random bytes and do not transmit anything sensitive. MyDevTools UUID Generator runs in your browser with no server round-trip.

Can I generate UUIDs in bulk online?

Yes. MyDevTools UUID Generator lets you set a count and generate multiple UUIDs at once, ready to copy as a list.