Utilzivo

UUID Generator

Generate random version-4 UUIDs for your apps, databases, and APIs. A UUID is a 128-bit unique identifier like 550e8400-e29b-41d4-a716-446655440000 — practically guaranteed to be unique without any central coordination. Generate one, five, or ten at a time, each with its own copy button. IDs are created with your browser’s cryptographic random generator, making them suitable for session tokens, API keys, and anywhere else unpredictability matters.

How to Use the UUID Generator

  1. Choose how many UUIDs you need: 1, 5, or 10.
  2. Click Generate UUIDs.
  3. Click Copy next to any UUID to copy it to your clipboard for immediate use.

Practical example

You are designing a database table for user uploads and want each file to have a unique ID that works even if two servers create records at the same time. Generate ten UUIDs here, copy one into your seed script, and use the rest as test fixtures. Because version-4 UUIDs are random, the chance of two ever colliding is astronomically small — no central counter needed. They also make great idempotency keys for payment APIs: generate one per checkout attempt and the payment gateway can safely ignore accidental duplicate submissions.

Key features and benefits

  • True version 4: follows the UUID standard with the version and variant bits set correctly.
  • Cryptographically random: uses crypto.getRandomValues(), not a predictable random function.
  • Batch generation: get up to ten at once for seeding tests or fixtures.
  • One-click copy: every UUID has its own copy button with confirmation feedback.
  • No tracking: IDs are made locally; nothing is logged or sent anywhere.
  • Standard format: classic 8-4-4-4-12 hexadecimal layout that every system accepts.

Limitations

These are random (version 4) UUIDs only — the tool does not generate time-based (v1) or name-based (v3/v5) variants. While collisions are practically impossible, UUIDs are not a substitute for proper uniqueness constraints in your database. On very old browsers without crypto.getRandomValues(), the tool falls back to a weaker random source. Also remember that UUIDs are long: if you need short, human-friendly codes for things like order numbers, a different ID scheme will serve you better.