Why it matters
Validates manifest.json for installability: icons, maskable safe zone, scope, start_url, display and shortcuts.
Manifest spec member parsing with type checks; Chromium installability criteria (documented); icon list analysis and dropped-icon preview with 80% safe-zone overlay; screenshots form_factor; id vs start_url. Optional fetch of the manifest and its link from the page. Everything runs in your browser; nothing you paste is sent unless you press Fetch.
How to use it
- Paste your input, or press Fetch to read a live URL you give.
- Read the results and the notes.
- Copy or download the output you need.
- If you used Fetch, check a sample on the live site too.
FAQ
Is my URL or page stored?
No. Fetch reads the address you give once, as LeejTools/1.0, and leej.uk keeps only a count. Pasted text never leaves your device.
Will this change my site for me?
No. It shows results and, where it writes rules or files, you copy them and apply them yourself.
Can I rely on this as official guidance?
It follows public documentation and well-known algorithms, and tells you where it is a subset or a simulation. Confirm critical changes in the official tool or a staging environment.
