Web app manifest checker

Check a manifest before shipping it.

Validate manifest JSON, summarize launch behavior, and catch common name, URL, display, color, and icon omissions without sending the file anywhere.

Site origin for URL checks

Manifest JSON

Manifest summary

Findings

Keep identity and launch scope aligned

The manifest name, icon, start URL, identifier, and scope shape how an installed experience appears and launches. Use stable identifiers, provide sufficiently large icons, and test installation in every browser family you intend to support.