Sprite Sheet Builder

Sprite Sheet Builder is a set of free, browser-only sprite tools for 2D game developers. Pack PNG, JPG, WebP, GIF or HEIC frames into one transparent sheet with grid or auto-pack layout and adjustable padding and spacing, then preview the loop at 1-30 FPS before exporting. Split an existing sheet by grid or by transparent-region detection and download the frames as individual transparent PNGs. Convert animated GIFs into sprite sheets and back. Exports are engine-ready: TexturePacker-style JSON for Phaser and Unity, a Godot .tres SpriteFrames resource, and Sparrow XML for Flixel-family engines. The FNF Sprite Sheet and XML Generator groups animations and exports Sparrow XML plus a Psych Engine character JSON in one ZIP, and can re-import an existing atlas. Files never leave the browser - decoding, packing and export all run on the visitor's device, with no account and no watermark. There is also an optional AI Sprite Generator demo; live generation is credit-based and not on sale yet. Engine guides for Unity, Godot and Phaser are at /engines.