About this utility
How to use Web App Manifest Validator
Validate a PWA manifest and explain installability-relevant names, icons, URLs, display modes, and shortcuts.
What to provide
Paste manifest.webmanifest JSON. Icon and start URLs are resolved syntactically but never fetched.
- Paste, type, or drag and drop a supported text file into the input area.
- Choose the options that match your intended result.
- Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.
What the result means
Normalized manifest summary with errors, warnings, icon coverage, and installability guidance.
Privacy and safety
This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.
Limitations
- Actual installability also depends on HTTPS, service-worker behavior, fetched icon validity, browser policy, and current platform rules.
Try the included example
Select “Load example” at any time to restore this tested sample.
{"name":"Local Tools","short_name":"Tools","start_url":"/","display":"standalone","icons":[{"src":"/icon-192.png","sizes":"192x192","type":"image/png"},{"src":"/icon-512.png","sizes":"512x512","type":"image/png"}]}