Your files stay on your device

# PWA manifest checker

Paste a web app manifest and see which installability fields hold up, from names and scope to icon sizes and maskable purpose.
Web app manifest JSON

Paste a manifest to check it.

This tool is paste-only. Reading another site's manifest from a browser fetch fails CORS, and this page never fetches, so the manifest comes from you: view-source, curl, or a DevTools copy. And valid never means the browser will offer to install it. HTTPS, a registered service worker with a fetch handler, and the browser's engagement heuristics all sit outside any local manifest check.
Options

## More web & auth tools

- [CSP evaluator & builder](/web/csp)
- [HTTP header parser](/web/headers)
- [HTTP status reference](/web/http-status)
[All web & auth tools](/web)

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Canonical HTML: https://nutter.tools/web/pwa-manifest-checker
Markdown version: https://nutter.tools/web/pwa-manifest-checker.md
Plain-text version: https://nutter.tools/web/pwa-manifest-checker.txt
Agent index: https://nutter.tools/llms.txt