The Substance Painter exporter lets you publish 3D files straight from Substance Painter to Sketchfab. It also includes automatic PBR texture export features.
As of Substance Painter 1.5.0, exporting to Sketchfab is natively integrated! If you purchase or upgrade to the latest version, you can already upload your models directly from Substance, complete with PBR textures!
When the upload is complete, you can view your model on Sketchfab, adjust rendering settings, and save the default view. You can also open the local folder with your exported files.
For more detailed instructions and other information, visit the blog or watch the video above.