You can also rename them before saving them, but this depends on your browser settings. Whenever I download a file I get a file save window that asks me where I want to save it and I can also change the file name before saving.
Firefox: https://support.mozilla.org/en-US/questions/1074901
Chrome: https://lifehacker.com/make-chrome-ask-where-to-save-downloaded-files-by-chang-1790840372
I’m sure there are similar instructions for other browsers.
