Sprite Sheet Packer

Drop a folder of sprites; get back a single packed texture atlas plus a JSON manifest with each sprite's coordinates. For game developers (Unity, Phaser, PixiJS, Godot) and web devs (CSS sprites for icon sets) who want to reduce HTTP requests or draw calls.

Why sprite sheets

For games, drawing one big texture is far cheaper than drawing many small ones — the GPU batches all sprites in one draw call instead of switching textures dozens of times. For web, one sprite-sheet HTTP request beats 30 individual icon requests; modern HTTP/2 narrows the gap, but sprite sheets are still smaller overall after compression.

Packing algorithms

• MaxRects (default): efficient bin-packing, minimises wasted space.
• Skyline: faster but slightly less efficient. Good for dynamic atlases.
• Grid: uniform cells. Useful when all sprites are the same size.

Output formats

1. PNG atlas: the packed texture.
2. JSON manifest: per-sprite coordinates, dimensions, anchor point.
3. Unity .meta: Unity-importable metadata.
4. CSS sprite class: ready-to-paste CSS for web sprites.
5. Phaser / PixiJS / TexturePacker JSON: for popular game frameworks.

Configuration

• Max atlas size: 2048, 4096, 8192. Bigger = fewer atlases for many sprites.
• Padding: 1–8 px gap between sprites to prevent texture bleeding.
• Power-of-2: on for older mobile GPUs, off otherwise.
• Trim: strip transparent pixels per sprite to save space.