Random UUID Generator

Generate random UUID v4 values instantly. Create one or hundreds at once, customize formatting, and copy them with a single click.

Random UUID Generator
Generate UUIDs (v4) instantly - runs locally in your browser.
Options
V4
1–500 per batch.
Formatting
What this tool does
  • Generates cryptographically-random UUID v4 values
  • Lets you output multiple UUIDs at once
  • Supports common formats: hyphens, uppercase, braces
UUID OUTPUT
5 UUIDs ready to copy.
Tip: Use UUIDs as unique identifiers for databases, APIs, test data, and object keys. Generate multiple IDs and copy in one click.
UUIDs are generated locally using your browser’s cryptographic RNG. Nothing is uploaded or stored.

How the Random UUID Generator works

UUID v4 values are generated from random bytes and formatted according to the UUID specification. This tool performs the generation entirely in your browser using cryptographic randomness.

You can generate a single UUID or a bulk list, then customize the output format to match the requirements of your database, API, or programming language.

  1. UUID v4: Random-based UUIDs with extremely low collision probability.
  2. Bulk generation: Create multiple UUIDs at once for fixtures or datasets.
  3. Formatting options: Toggle hyphens, uppercase output, or braces.
  4. Local execution: Runs entirely in your browser with no uploads.

When and why to use UUIDs

UUIDs are widely used in modern applications where identifiers must be unique across systems, services, or environments.

Unlike auto-incrementing IDs, UUIDs can be generated client-side and merged safely across distributed systems without coordination.

  1. Databases: Use UUIDs as primary keys or external references.
  2. APIs: Create stable resource identifiers and request IDs.
  3. Distributed systems: Avoid ID collisions across services and regions.
  4. Logging & tracing: Attach unique IDs to events and requests.

UUID v4 vs other UUID versions

UUID v4 is random-based and the most commonly used UUID type in modern software.

Other UUID versions (like v1 or v7) encode time or ordering information, which may be useful in some databases but can leak metadata.

  1. UUID v4: Random, privacy-friendly, and easy to generate client-side.
  2. UUID v1: Time-based and may expose timestamps or MAC addresses.
  3. Ordering: UUID v4 is not ordered; use ordered UUIDs only if required.
  4. Compatibility: UUID v4 works with most databases and frameworks.

FAQ

What is a UUID v4?

UUID v4 is a universally unique identifier generated from random numbers. It’s commonly used as a unique ID for records, API resources, and events as defined in RFC 4122.

Is this UUID generator truly random?

Yes. It uses your browser’s cryptographically secure random number generator (and crypto.randomUUID when available), which is designed to produce collision-resistant values.

Can I generate multiple UUIDs at once?

Yes. You can generate a bulk list of UUIDs at once, which is useful for test data, fixtures, or batch inserts.

Can I generate UUIDs without hyphens or in uppercase?

Yes. You can remove hyphens, output uppercase UUIDs, or wrap them in braces to match common database or language conventions.

Does this tool upload or store my UUIDs?

No. All UUIDs are generated locally in your browser. Nothing is uploaded, logged, or stored.