MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
EasyAppIcon - EasyAppIcon helps you to create your own app icons easily. Supporting Android Adaptive Icon!
Bjango App Icon Templates - App icon templates for PS, Ai, Sketch and Affinity Designer
ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
Flat Icon Generator - Create stylish, flat icons for Android apps.
App Icon Maker - Create icons for mobile app stores online for free.