Online converters are good if you have a source icon (bitmap) of a big size that can be downscaled to PNG bitmaps of smaller sizes with good quality. But what if you have a favicon icon of 16x16 or max 32x32? Upscaling it to 144x144 and bigger sizes will produce very blurry images...

but usually the logo of a website is bigger then 16x16. using the as source would not create blurry images.

I asked about android-chrome-144x144.png. Do we really need it?

No, technically not.

What about safari-pinned-tab.svg? What is it? The online converter you recommended does not create this file. Do we need it and how to create it if it is required?

Then remove android-chrome-144x144.png from the next install package not to mislead us and not to give us an extra bit of work :)

You can remove it from the site.webmanifest. If you dont want to use it.

What about safari-pinned-tab.svg? What is it? The online converter you recommended does not create this file. Do we need it and how to create it if it is required?

Just ignored it, Its just a black frame. you dont have to replace it

What is it??

I do not know what is site.manifest and did not find it in the YAF 2.30.7 installation package.

What is it??

Looks like the file is not included at the moment. Will be added in the next update. So at the moment you can ignore that file.