Does anyone know how to convert otf to ttf? I tried every possible website on google but nothing is working

Why would you want to do that? OTF is backwards compatible with TTF.

I've done this often, with FontLab Studio5. I right-click the .otf file, then select 'Open with...' -> Studio5, then File from the menu bar -> Generate font -> .ttf type -> OK. My primary font editor, ScanFont 3, can neither create nor open .otf, so I sometimes create .ttfs to view the vector designs, or to make screen captures.

Because I am using an android and OTF is not compatible with my phone.

Thank you metaphasebrothel

http://caniuse.com/#feat=ttf