I mean, articles of online media processed by Outline.com look simply perfect, without ads, banners and other useless stuff for a reader. But so far I have never managed to download them on my computer in pdf, html or any other format (for example, the “print/save as pdf” command does work, but then the pdf file downloaded is unreadable...). Any workaround?

Many thanks to both of you for your answers. Unfortunately, none of the solutions you suggested proved to be conclusive: the “reader view” on Firefox is definitely worth trying, but its pdf output is not consistent, it is either neat or messy depending on the source text; the online conversion tools or the pdf reading applications do not fix this issue cuz the problem here is not converting an online page to pdf, but opening the pdf file so created and make it a neat reading.