Texture Atlas Generator
Upload multiple sprites and pack them into a single, optimized texture atlas.

Texture atlases are fundamental to 2D game performance. Every separately-loaded texture forces the renderer to switch state between draw calls; packing sprites into one texture lets the engine batch hundreds of sprites into a single draw. The difference is very visible on mobile GPUs and in browser games, where draw-call overhead is CPU-side and expensive.

Three packing algorithms are available, and the right one depends on your sprites. MaxRects tracks the free rectangles left after each placement and fits new sprites into gaps — it produces the tightest layouts for mixed sizes and is the right default. Shelf packing places sprites in rows and is nearly instant, useful when you're re-packing constantly during iteration. Grid packing puts every sprite in a uniform cell, which wastes space but is exactly what you want when your engine indexes frames by row and column instead of reading a data file.

Two options prevent the most common atlas rendering bug — texture bleeding, where a sliver of the neighboring sprite appears along an edge. Padding inserts empty pixels between sprites; extrusion duplicates each sprite's edge pixels outward so linear filtering samples the sprite's own color instead of its neighbor's. If you see hairline seams at sprite edges in-engine, enable 2px extrusion. Power-of-two sizing (256, 512, 1024, 2048…) is also available for GPUs and importers that want it, along with transparent trimming, which crops each sprite's empty border before packing and stores the offset in the metadata so your engine can restore the original bounds.

Duplicate detection hashes each image and packs identical sprites only once, recording aliases in the metadata — useful when animation exports contain hold frames. Multi-resolution export generates @2x/@1x/@0.5x variants in one pass. Metadata exports cover Unity, Godot, Phaser, PixiJS, Spine, Starling XML, CSS, and generic JSON.