No download step means no waiting for an installer, and no wondering what else came bundled with it.
Downloaded audio utilities sometimes arrive with extra toolbars, background processes, or unclear permissions. A browser tool sidesteps that entirely — it can only do what the page in front of you does, and it disappears the moment you close the tab.
Desktop software eventually asks you to update, restart, or re-enter a license key. A page-based tool has none of that friction — refreshing the page always gives you the current version automatically.