Sprite Sheet Builder

Sprite Sheet Builder does one fiddly job and does it well: turning a folder of animation frames into a clean sprite sheet. Drop in PNG, JPG, WebP or GIF frames and it packs them into a transparent sheet, lets you preview the animation in the browser, and exports the sheet as PNG with JSON or XML metadata that game engines understand. Everything runs locally in the browser, there is no sign-up and it is free, which makes it a nice companion to AI image generators: generate your frames with whatever model you like, then pack them here. It suits indie game developers, pixel artists and anyone animating for the web who does not want to open a heavy editor for a packing job. The honest trade-offs: it is a packer, not an editor, so frame cleanup happens elsewhere, and very large sheets depend on your browser's memory. For fast, free sprite packing, it earns its bookmark.