Android (Chrome):
Settings → Languages & Input → Text-to-speech → Install voice data → Bahasa Indonesia. Pilih Google TTS sebagai default engine.

iOS / iPhone:
Settings → Accessibility → Spoken Content → Voices → Indonesian. Pilih "Damayanti" atau voice ID lainnya untuk diunduh.

Windows:
Settings → Time & Language → Language → Add a language → Bahasa Indonesia → Install. Lalu restart browser.

Mac:
System Settings → Accessibility → Spoken Content → System Voice → Manage Voices → Indonesian (Damayanti).