Pixel ArtのAdobe Photoshopなどのソフトウェアをお勧めします。ただし、Photoshopはあなたの用途には高すぎるか複雑になる場合があります。Gimp、Krita、Piskel、Aseprite、Piko Pixel、Pyxel Edit、GraphicsGale、Tile Studio、Paint.netなど、オンラインでも利用できる他の選択肢があります。これらのいくつかは、GIMPなどのより一般的な目的ですが、他のものはピクセルアートにより焦点を合わせています。それらの多くは無料で、素晴らしいボーナスです。
I would recommend software such as Adobe Photoshop for pixel art due to its prominence, power, and flexibility. However, Photoshop may be too expensive or complicated for your uses. There are other alternatives available online which may also be useful such as GIMP, Krita, Piskel, Aseprite, Piko Pixel, Pyxel Edit, GraphicsGale, Tile Studio, Paint.NET, and more. Some of these are more general purpose such as GIMP, while others are more focused on pixel art. Many of them are also free which is a great bonus.