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Developer Tools

Web App Manifest Checker

Read a web app manifest and check it has what an installable app needs.

Processed in your browser

Your result will appear here as soon as you add some input.

How to use it

  1. 1Paste your input into the input box, or type it directly.
  2. 2Adjust the options if you need something other than the defaults.
  3. 3The result updates as you type.
  4. 4Copy the result to your clipboard or download it as a file.

About the Web App Manifest Checker

The install prompt has hard requirements: a name, a short name, a start URL, a display mode other than browser, and an icon of at least 512 × 512. Missing any of them is the usual reason a prompt never appears.

A maskable icon is not required but is strongly recommended - without one, Android draws your square icon inside a white circle.

Questions people ask

Is your code uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your code never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.

Is it free, and do I need an account?

Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.