Should Bismillah be said aloud or silently before the khutbah (for Jumu’ah)?
Not aloud nor silently. Only Ta’awwuz (A’udhu Billah) should be recited and that being silently before the khutbah is delivered .
And Allah ﷻ knows the best
Imam Ahmad Rida Khan رحمة الله تعالى عليه
Translation by Dr Musharraf Hussain Al-Azhari Translator of Majestic Quran, www.majesticquran.co.u