victorygc Hello, thanks for your answer. I would like to know if it's possible to export the same data format using the runtime libraries. For example: exporting a GIF directly from a function in JavaScript.
Mario You can use something like gif.js https://jnordberg.github.io/gif.js/ Playback your animation using the Spine Runtimes, and each frame, pass the canvas to gif.js to add the current frame to the GIF.
