UUID Generator

Generate secure RFC 9562 version 4 UUIDs online. Create up to 100 collision-resistant identifiers with custom formatting for APIs, databases, and integrations.

Input

Generate between 1 and 100 identifiers in one run.

The UUID Generator creates RFC 9562 version 4 identifiers directly in your browser so you can seed databases, tag analytics events, or mint API keys without exposing sensitive data to a server.

What is the UUID Generator?

It is a browser-first UUID generator that outputs RFC 9562 v4 identifiers you can drop into databases, API payloads, or infrastructure scripts without installing CLI utilities.

How the UUID generator works

A version-4 UUID is 122 random bits plus 6 fixed bits. The tool draws 16 cryptographically secure random bytes from the Web Crypto API (crypto.getRandomValues), sets the version nibble to 4 and the variant bits to 10, and formats the result as the canonical 8-4-4-4-12 hexadecimal string. Because the randomness is cryptographic rather than Math.random, the identifiers are collision-resistant at practical scale — you would need to mint on the order of a billion UUIDs before a collision becomes at all likely. Everything runs locally in your browser, following RFC 9562, which obsoleted RFC 4122 in May 2024.

Key Features

RFC 9562 compliant randomness powered by the Web Crypto API.
Generate up to 100 unique identifiers per click for bulk workflows.
Formatting toggles for uppercase output, hyphen removal, and optional braces.
Runs entirely in the browser so secrets and internal IDs stay private.

How to Use

1

Set the quantity between 1 and 100 to control how many UUIDs the tool should return.

2

Toggle uppercase, hyphen, or brace options to match the format your platform expects.

3

Click Run Tool to generate the batch instantly using secure random bytes.

4

Copy the UUID list and paste it into your environment variables, database seeds, or QA scripts.

Common Mistakes to Avoid

Leaving the quantity at zero or blank, which produces a validation error. Always request at least one UUID.
Removing hyphens when a downstream system expects the canonical 8-4-4-4-12 format.
Mixing uppercase and lowercase in the same batch, which can confuse case-sensitive comparisons. Use the uppercase toggle for consistent casing.

Examples

Provision 25 UUIDs to pre-populate IDs in a staging database seeder.
Generate uppercase, brace-wrapped identifiers for inserting into JSON schemas or config files.
Quickly mint a single UUID when you need to label a support ticket, Git branch, or S3 object.

See also

  • JSON Formatter — Dropping UUIDs into an API payload? Validate the surrounding JSON first.
  • Password Generator — Need a secret rather than an identifier? Use the CSPRNG-backed password generator.

FAQ

Are the UUIDs compliant with RFC 9562?

Yes. We rely on the browser's Web Crypto API to produce version 4 UUIDs with the correct variant and version bits, matching the RFC 9562 specification (which obsoleted RFC 4122 in May 2024).

How many UUIDs can I generate at once?

You can create between 1 and 100 identifiers per run. Adjust the quantity field to match your batch needs.

Is any of my input data uploaded?

No. All randomness and formatting happens locally in your browser, so nothing is transmitted anywhere.