How to factory reset your Samsung Galaxy S5 to wipe all data

If you're looking to hand off a Samsung Galaxy S5 to someone else and there's already stuff on there, it's wise to do a factory reset to wipe all of the existing data from the device. This is a pretty straightforward process, but a vital one if you want to keep your personal data secure. Make sure to keep your Samsung Galaxy S5 plugged in and charging during this process, since having your phone die in the middle of it can lead to permanent damage.

source: androidcentral