First , check your device .

First, check your device. Its likely that your manufacturer/carrier has packaged your device with one full premium office suite. If there are none, jump to Play Store. Generally, all vendors publish a office viewer for free which could advertise their premium paid app having editing feature. But still, there are some Office Suites which allow editing for free: Kingsoft Office Highly Rated & also recommended by me. It'll give you real office editing experience for free. Olive Office Premium