Hey guys,

https://spineviewer.online/
The tool supports preview spine animations online, support different runtime versions, and change background color easily.
Select spine exported files to preview (.json, .atlas, .png) or (.skel, .atlas, .png), also support .json.txt, .skel.txt, .atlas.txt
Support spine: 3.6.x, 3.7.x, 3.8.x, 4.0.x, 4.1.x, 4.2.x, 4.3.x
And the Export as video feature will be coming soon.