Easiest is Firefox 'Save as PDF'. If you need more control (custom margins, JS wait, viewport size), PDFBolt has a free URL to PDF tool that runs in mobile browsers without signup

Yes, some browsers allow you to save url as PDF. Or Search Google: "site to convert url as PDF." Hope, that helps!

Yes, it depends on the browser being used. Some browsers allow that: "Save as PDF"

In Firefox on Android you can just simply "Save as PDF".

I found some webpage to pdf websites, if that works for you. Nothing to install.