⚙️ WasmTools

UUID / GUID Generator Online

Free online UUID (v4) generator. Generate one or hundreds of random UUIDs instantly in your browser — Rust + WebAssembly, nothing uploaded.

Loading WebAssembly engine…

Use it in your terminal (or let an AI agent run it)

This tool also ships as a command-line version in the wasm-tools-cli npm package — the exact same engine as this page, running locally on your machine.

npx wasm-tools-cli uuid generate --count 10
🔒 Runs entirely in your browser — your files never leave your device.

About UUID Generator

UUID Generator is a free online data tool that runs entirely in your browser. There is nothing to install and no account to create: open the page, use the tool, and download the result. Because all processing happens locally on your device (via WebAssembly), your files and text are never uploaded to any server.

How to use UUID Generator

  1. Paste or type your content into the input box.
  2. Choose the operation (and any options) and click the corresponding button.
  3. Copy the result or download it as a file.

Frequently asked questions

Is UUID Generator really free?

Yes — UUID Generator is completely free, with no account, no watermark, and no usage limits. It runs entirely in your browser.

Are my files uploaded to a server?

No. All processing happens locally on your device using WebAssembly. Your files never leave your computer — close the tab and nothing remains.

Which browsers are supported?

Any modern browser on desktop or mobile: Chrome, Firefox, Safari, and Edge.

Related tools

Age Calculator

Calculate exact age in years, months, and days, plus total days/weeks/hours lived and a next-birthday countdown.

runs locally

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text, instantly in your browser.

WebAssemblyCLI / agent

Case Converter

Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and kebab-case.

WebAssemblyCLI / agent

Color Converter

Convert colors between HEX, RGB, and HSL formats instantly.

WebAssemblyCLI / agent

Color Palette Extractor

Extract the dominant colors from any image as a hex palette with percentage shares.

runs locally

Cron Parser / Schedule Explainer

Translate any 5-field cron expression into plain English and see the next 10 run times — computed locally in your timezone.

runs locally