Our friends at Sketchfab and Allegorithmic have worked together so that you can now export from Substance Painter to directly Sketchfab for online 3D viewing. From there, you can embed the Sketchfab directly into ArtStation for showcasing your 3D models with beautiful textures and physically based materials/lighting from Substance to the massive ArtStation community.
To celebrate this integration, Sketchfab is giving all Substance Painter users a free 90-day Sketchfab PRO license. Just upload a model with the new exporter and the 90 days will be added to your Sketchfab account. More details here.