Are these UUIDs truly random?

Yes. Each UUID v4 is generated using crypto.randomUUID() (or a crypto.getRandomValues() fallback), which relies on the browser's cryptographically secure random number generator.

Are the UUIDs sent to any server?

No. All generation happens entirely in your browser using JavaScript. Nothing is transmitted over the network.

What is the maximum number I can generate?

The tool allows up to 10,000 UUIDs in a single batch. For larger needs, run multiple batches and combine the output.

Can I get UUIDs with curly braces like {xxxxxxxx-...}?

Yes. Enable the "Curly braces" option to wrap every UUID in curly braces, as commonly required by .NET/GUID consumers.

What is the difference between UUID and GUID?

They are functionally the same. "GUID" (Globally Unique Identifier) is Microsoft's name for UUID. Both follow the same RFC 4122 standard.

UUID List Generator

Generate a list of random UUID v4 identifiers instantly in your browser — choose count, case, format, and separator.

Options

Number of UUIDs

max 10,000

Format

Uppercase Curly braces (GUID style)

Separator

One per line Comma-separated Comma + newline

0 UUIDs generated

Click Generate to create your UUID list

Copied!

Summary

This tool uses the Web Crypto API built into your browser to generate cryptographically random UUID v4 identifiers. No data is sent to any server — everything runs locally. You can generate up to 10,000 UUIDs at once and export them in one-per-line or comma-separated format.

How it works

Enter how many UUIDs you want (1 to 10,000).
Choose uppercase or lowercase output.
Optionally wrap each UUID in curly braces.
Pick one-per-line or comma-separated output.
Click Generate and copy or download the results.

Use cases

Seed a database with unique primary keys for testing.
Generate fixture data for unit or integration tests.
Create bulk GUIDs for spreadsheet or CSV imports.
Populate a mock API response with unique identifiers.
Test UUID validation logic in backend services.
Quickly generate trace or correlation IDs for log analysis.

Frequently Asked Questions

Last updated: 2026-10-05 · Reviewed by Nham Vu