iPad charges fastest with a charger and cable that both support MagSafe. Apple’s magnetic wireless charging system for iPhone, which also inspired the magnetic-alignment approach in Qi2.
Using a charger that doesn’t support the device’s preferred fast-charging standard isn’t unsafe — it just falls back to a slower, universally-supported charging rate, typically 5W to 10W over basic USB.
Wireless charging typically tops out well below the device’s maximum wired speed, trading charging time for convenience.
What to buy
Look for a charger explicitly labeled with MagSafe support, paired with a cable rated for the same wattage — a mismatched cable is the most common reason fast charging silently doesn’t kick in.