What is a manifest file actually used for?

It tells browsers how your site should behave when a user adds it to their home screen or installs it as a web app — its name, icon, colors and display mode.

Do I need a manifest file for every website?

Only if you want your site to support being installed as a web app (a PWA) — a standard website without that functionality doesn't require one.

What icon sizes should I provide?

Multiple sizes are recommended so the correct resolution is available for different devices and contexts — the generator lets you specify each icon and its size.

Does Web Manifest Generator upload my files to a server?

No. Web Manifest Generator runs entirely in your browser using on-device processing, your files never leave your device.

Web Manifest Generator

Generate a web app manifest.webmanifest file.

Runs in your browser

App nameShort nameTheme colorBackground colorIcon URL

manifest.webmanifest

{
  "name": "My App",
  "short_name": "My App",
  "start_url": "/",
  "display": "standalone",
  "background_color": "#ffffff",
  "theme_color": "#1f6feb",
  "icons": [
    {
      "src": "/icon-512.png",
      "sizes": "512x512",
      "type": "image/png"
    },
    {
      "src": "/icon-512.png",
      "sizes": "192x192",
      "type": "image/png"
    }
  ]
}

About this tool

A web app manifest file tells browsers how your site should behave when installed or added to a home screen — its name, icons, colors and display mode — and it needs to follow a specific JSON structure to work correctly across browsers. This tool generates a properly formatted manifest.webmanifest file from the details you provide, giving you valid, ready-to-use manifest JSON without needing to reference the specification yourself.

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