JoliTools

UUID Generator

Generate cryptographically secure UUID v4 IDs

  • 5333751f-c02e-4ee3-b354-b5d2ee478152
  • d90b4f06-3cf8-4778-9cbd-21c3562ff4fd
  • e0963f17-cb5c-4664-908e-96f9bdc3a86d
  • f83a6ffb-4f81-4f19-9434-0154bd25d87e
  • a4ddab93-5b34-42a0-b8a0-1e88d9867cd0

Version 4 UUIDs from your browser's cryptographic random number generator (crypto.randomUUID). Nothing is sent or stored anywhere.

About this tool

Universally unique identifiers (UUIDs) are the standard way to create collision-free IDs for database rows, API resources, distributed systems, and test fixtures. Generating them by hand or writing a one-off script every time is tedious. This free UUID generator creates cryptographically secure version 4 UUIDs in your browser, one click, up to 50 at a time, no signup.

The IDs come from crypto.randomUUID(), your browser's interface to the operating system's cryptographic random number generator. That means the same quality of randomness as server-side UUID libraries, suitable for real database primary keys and public-facing resource IDs, not just throwaway test data.

How to use the uuid generator

  1. 1Use the slider to choose how many UUIDs you need (1 to 50).
  2. 2Optionally enable Uppercase or No hyphens to change the format.
  3. 3Click “Generate UUIDs” to create a fresh batch instantly.
  4. 4Copy individual IDs with the per-item copy buttons, or copy them all at once with “Copy all”.

Good to know

Format options cover the common cases: standard lowercase hyphenated form, UPPERCASE for systems that expect it, and the compact 32-character no-hyphen form used by many APIs and compact database columns. Everything runs locally with no network calls, so there is no risk of a third party logging the identifiers you generate.

Frequently asked questions

Version 4 UUIDs (random), generated with your browser's cryptographic random number generator via crypto.randomUUID(). They are suitable for database keys, request IDs, and unique identifiers.

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