Try Krita . Its wrap-around mode makes tile-matching a breeze.
Whether you’re a seasoned indie dev or a hobbyist just starting your first sprite sheet, finding the right tools shouldn't break the bank. Pixel art thrives on constraints, but your budget doesn't have to be one of them. 1. LibreSprite (The Best Desktop Alternative) pixel art software free download
Start with Piskel . You’ll be making a walking animation in under ten minutes. Try Krita