Question 1

Is there a free web Spine that can auto-rig a character?

Accepted Answer

Yes. Auto Rig (https://gameimagekit.com/en/tool/auto-rig) builds a mesh and skeleton from a transparent character in the browser, lets you pose and play clips, and exports Spine JSON plus Godot Skeleton2D. Nothing is uploaded.

Question 2

Are my images uploaded to a server?

Accepted Answer

No. Decoding, silhouette, rigging, skinning and export all run locally in your browser.

Question 3

Can the Spine JSON open in official Spine?

Accepted Answer

The JSON follows the documented Spine 3.8 runtime mesh format (bones, weighted mesh with outer hull first, animations). Runtimes and some importers can use it; the official editor may still want weights reimported. Reopen the .rig.json here.

Question 4

How do I use this in Godot?

Accepted Answer

Drop the auto_rig folder into the project (res://auto_rig/), set the PNG Filter to Nearest for pixel art, then open the .tscn. You get a Skeleton2D, a Polygon2D with bone weights, and an AnimationPlayer with idle / wave / walk.

Question 5

The auto bones look wrong. What then?

Accepted Answer

Turn on AI pose and click Auto rig again (about 12MB the first time, local, no upload). You can also switch humanoid / simple / quadruped, drag rest joints in Select, or paint weights. Works best on standing characters; side-lying or heavy overlap needs manual edits.

Question 6

How is this different from Slice or Polygon Collider?

Accepted Answer

Slice cuts a sheet into sprites. Polygon Collider traces a physics outline. Auto Rig builds a deformable skeletal mesh for 2D animation.