It works on Linux and Windows. Any issues please let me know and I will fix them.

Universal Spritesheet Builder

Universal Spritesheet Builder is a Windows desktop application designed to make organizing, previewing, and exporting 2D animation frames faster and easier.

Import a folder of PNG or WebP images, assign frames to specific animations and directions, and generate a complete transparent spritesheet without manually positioning every image. The built-in mapping workspace allows you to drag and drop frames into the correct animation slots, making it easy to correct ordering or customize your final layout.

The program includes presets for popular game-development engines and workflows, including Unity, Godot, RPG Maker, Unreal Engine, and GameMaker. Each preset provides compatible sprite sizes, sheet layouts, directions, and animation structures to help you prepare assets for your chosen engine.

Preview individual animations before exporting to confirm that movement, direction, and frame order are correct. Once your spritesheet is ready, export it as a transparent PNG along with optional JSON metadata containing frame positions, dimensions, animation names, and directional information.

Key Features

• Import PNG and WebP animation frames from a folder
• Automatically assign imported images to available frame slots
• Drag-and-drop frame mapping and reorganization
• Built-in presets for Unity, Godot, RPG Maker, Unreal Engine, and GameMaker
• Multiple sprite sizes and sheet-layout options
• Directional animation support
• Live spritesheet preview
• Individual animation and direction playback
• Transparent PNG export
• Generic, Unity, Godot, and GameMaker JSON metadata export
• Self-contained Windows application
• No separate .NET installation required

Universal Spritesheet Builder is ideal for pixel artists, independent game developers, asset creators, and anyone who needs a straightforward way to turn collections of animation frames into organized, engine-ready spritesheets.