Utilix
Developer Tools

UUID Generator

Generate UUID v4 (random) or UUID v7 (time-ordered) in bulk. Up to 1000 at once.

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About UUID Generator

UUID Generator produces random UUID v4 identifiers — the default for primary keys in most databases — or time-ordered UUID v7 (RFC 9562), which sort lexicographically by creation time. Generate up to 1000 at once. Uses crypto.getRandomValues for cryptographically strong randomness. Runs in your browser; nothing is logged, sent over the network, or persisted between sessions. UUID v4 is the safe, boring default that works everywhere — 122 bits of randomness give you essentially zero collision probability across the lifetime of any application you'll build. UUID v7 (standardized in RFC 9562 in 2024) puts a 48-bit Unix timestamp in the high bits, so v7 IDs sort by creation time when stored in a database. That's a big win for primary-key indexes, which can suffer from random-write hotspots when keys are scattered across the index pages. v7 IDs are also much friendlier when scanning logs or debugging — you can tell at a glance which event came first.

How UUID Generator works

  1. Pick the version: v4 (fully random) for general use, or v7 (timestamp-prefixed, sortable) for database keys.
  2. Pick how many to generate — 1, 10, 100, or up to 1000 at a time.
  3. The tool calls crypto.randomUUID for v4, or builds v7 byte-by-byte using crypto.getRandomValues plus the current Unix timestamp.
  4. All IDs render in a copyable list — click any one to copy that single ID, or 'Copy all' to grab the whole batch.
  5. Switch versions and regenerate; nothing persists between page loads.

When to use UUID Generator

  • Generate primary keys for a new database table during schema design.
  • Seed test fixtures with stable, distinct identifiers for unit and integration tests.
  • Create correlation IDs for distributed-trace debugging across services.
  • Generate idempotency keys for API requests that must be safely retryable.
  • Mint per-user or per-session IDs for analytics where you don't want to expose database row IDs.
  • Use UUID v7 for primary keys when you want chronological sorting without an extra created_at index.

Why choose Utilix UUID Generator

  • Cryptographically strong randomness — uses the browser's CSPRNG, the same source TLS uses for keys.
  • v4 and v7 in one tool. Most generators only do v4 and leave you to write v7 by hand.
  • Bulk generation up to 1000 — useful for seeding fixtures or load tests.
  • Nothing persists, nothing transmits — safe for any context including air-gapped or compliance-bound environments.
  • No signup, no daily limit, no ad walls.

Frequently asked questions