Aseprite is a pixel art tool that lets you create 2D animations for videogames.

Key features

• Compose sprites using layers & frames as separated concepts 
• Create images in RGBA or Indexed color modes 
• Open/Save GIF animations, sequence of PNG files, etc. 
• A timeline where you can copy/move layers, frames, or specific images 
• Animation tools: Real-time animation preview, onion skinning, tag frames 
• Pixel art tools: shading, pixel perfect strokes, RotSprite rotation, tiled mode, filled contour 
• Export/import sprite sheets 
• A command line interface to automate conversion and sprite sheets generation 
• Updates for the whole v1.x series up to v1.9.