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UUID Generator

Generate UUIDs (v4) in bulk — copy and use immediately.

What does this tool do?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify something — a database row, an API request, a file, a user session. They look like 550e8400-e29b-41d4-a716-446655440000. The v4 variant used here is randomly generated, making collisions (two identical UUIDs) so statistically unlikely that you would need to generate billions per second for thousands of years before the odds become meaningful.

How to use it

  1. Click Generate to create a new UUID v4.
  2. Click Copy to copy it to your clipboard.
  3. Click Generate again whenever you need a fresh one.

Pro tips

  • UUIDs are case-insensitive — the uppercase and lowercase versions refer to the same identifier.
  • If your database uses UUIDs as primary keys, make sure to index them — unindexed UUID lookups on large tables are slow.
Example

Click Generate

Example output: 7f3b4e2a-19cc-4d21-a890-f1c5e3d6b827

Every click produces a different, unique value.

When would you use this?

  • Creating primary keys for database records (avoids the sequential ID guessing security problem)
  • Generating a unique request ID to trace API calls through multiple services
  • Naming temporary files that will not clash with other files in the same directory
  • Creating session tokens or correlation IDs in web applications