Android
Alarm Volume Settings auf Android
Android keeps the alarm volume separate from media, call, and notification volume. That is why turning your phone to silent or lowering the music level does not change how loud your alarm rings in the morning.
To adjust it, go to Settings ➔ Sound & vibration ➔ and move the slider under Alarm volume. Dragging it left lowers the loudness, dragging it right increases it. The change applies immediately to every alarm you have set, including recurring ones.
When this setting is not enough
If the alarm still does not ring at the level you expect, check whether a specific alarm app overrides the system volume with its own internal setting. Some alarm clock apps ship with a separate loudness control that ignores the system slider.
Also confirm that Do Not Disturb is not set to block alarms, since some custom configurations mute even the alarm channel during quiet hours. If the slider itself appears greyed out, a connected accessibility profile or a media session from another app might be holding the audio focus.