The first thing to point out about portability is that not all browsers run on all operating systems. While { -brand-name-firefox }, { -brand-name-chrome } and { -brand-name-opera } work on all major systems and are easy to install, { -brand-name-ie }, { -brand-name-edge } and { -brand-name-safari } only work on { -brand-name-microsoft } and Apple’s own systems. The mobile version of { -brand-name-safari } is pre-installed on Apple’s mobile devices, and most { -brand-name-android } devices come with a pre-installed browser modified by the manufacturer for the device. { -brand-name-firefox }, { -brand-name-chrome }, { -brand-name-edge } and { -brand-name-opera } can easily be installed and even used side by side.

Y peth cyntaf i dynnu sylw ato am gludadwyedd yw nad yw pob porwr yn rhedeg ar bob system weithredu. Tra bod { -brand-name-firefox }, { -brand-name-chrome } ac { -brand-name-opera } yn gweithio ar bob system fawr ac yn hawdd eu gosod, dim ond ar systemau { -brand-name-microsoft } ac Apple eu hunain y mae { -brand-name-ie }, { -brand-name-edge } a { -brand-name-safari } yn gweithio. Mae fersiwn symudol { -brand-name-safari } wedi’i gosod ymlaen llaw ar ddyfeisiau symudol Apple, ac mae’r mwyafrif o ddyfeisiau { -brand-name-android } yn dod gyda porwr wedi’i osod ymlaen llaw, wedi’i addasu gan y gwneuthurwr ar gyfer y ddyfais. Mae'n hawdd gosod { -brand-name-firefox }, { -brand-name-chrome }, { -brand-name-edge } ac { -brand-name-opera } a hyd yn oed eu defnyddio ochr yn ochr a'i gilydd.