Developer Tools

UUID / ID Generator

Free ID generator for UUID v4, NanoID, and ULID. Switch Mode to match your stack’s identifier style—bulk copy for fixtures.

Quick start

Get test data in under a minute

This page combines UUID NanoID ULID in a single Random Data Hub toolkit. Use Mode to switch between UUID v4, NanoID, ULID without opening duplicate URLs.

  1. 1Open the Mode menu and pick the workflow you need.
  2. 2Fill any inputs the mode requires (text, counts, or options).
  3. 3Run the tool and review the output.
  4. 4Copy or download the result for your project.

Documentation

UUID / ID Generator guide

Learn how to build schemas, use blank percentages, export CSV/JSON, and generate realistic test data for your stack.

01

UUID generator and GUID basics

A UUID generator (also called a guid uuid generator on Windows/.NET) produces version 4 random identifiers: 36 characters with hyphens, e.g. 550e8400-e29b-41d4-a716-446655440000.

Random Data Hub generates UUIDs in your browser—no install, no account.

02

Generate UUID batches for dev and QA

Use generate uuid or uuid generator workflows: set count, click Generate, copy all lines into SQL INSERTs, seed scripts, or Postman variables.

Random UUID generator for tests

Each ID uses crypto-random bytes suitable for correlation IDs, message keys, and primary keys in staging databases.

Generated UUID list hygiene

Treat output as ephemeral—copy generated uuid values before navigating away. We do not store lists server-side.

03

RFC 4122 and common stacks

Output is RFC 4122 v4 formatted for PostgreSQL uuid, MySQL UUID(), Java UUID.randomUUID(), and JavaScript crypto APIs.

Postgres and MySQL seeds

Paste dozens of IDs into migration dry-runs or fixture files when ORMs need explicit primary keys.

When to use database functions

Production uniqueness guarantees may still rely on gen_random_uuid() or server-side generators—this tool is optimized for quick manual QA batches.

Common Use Cases

UUID v4

Use this hub when you need to UUID v4 without hunting for a separate tool page.

NanoID

Use this hub when you need to NanoID without hunting for a separate tool page.

ULID

Use this hub when you need to ULID without hunting for a separate tool page.

Tips and best practices

Random Data Hub consolidates related utilities so searchers land on one maintained page instead of thin duplicates.

Frequently Asked Questions

Quick answers about how this tool works and when to use it.

Why were the old pages removed?

Near-duplicate tools split attention and created thin content. This hub keeps the same jobs under Mode on one stronger page.

Will old URLs still work?

Removed sibling URLs permanently redirect to this hub with the matching Mode when possible.

Does my input leave the browser?

Typical paste-and-run workflows process data locally in your browser.

How do I find a former tool?

Open Mode and pick the labeled workflow that matches the old page name.

What does Uuid Generator create?

Uuid Generator creates uuid generator results you can copy into forms, fixtures, demos, or design files. Adjust the on-page options, generate a batch, and regenerate until the output fits your scenario.