by Nguyen-Phuc-Nguyen·Workflow
Images © Nguyen-Phuc-Nguyen. Used for product review; image policy.
Earns its place in the blender_extensions library as a focused utility for exporting and reimporting skin weights via JSON, with a choice of Position or UV mapping.
Import Export Skin Weights is an add-on for Blender that moves skin weights from one mesh to another through a JSON file. It exports the vertex groups, UV positions, and influences of every vertex on the selected mesh, and that file can be reimported onto any mesh that shares the same hierarchy skeleton. It works best when meshes share the same topology or the same UV.
Two mapping methods handle the reimport. Position mode maps by closest vertex position, while UV mode maps using vertex UV coordinates. The workflow is direct: select a mesh and use the Export button to save the JSON, then select the target mesh, choose a mapping method, and use the Import button to load the file.
The add-on is compatible with Blender 4.2 LTS and newer, is distributed under the GNU General Public License v3.0 or later, and requires no special permissions. It ranks within the blender_extensions library, and a demo video is available on the developer's page.
Import Export Skin Weights is best for transferring skin weights between meshes with matching topology or UVs, using a JSON file as the intermediate format.
Import Export Skin Weights is completely free to download and use.
Import Export Skin Weights lists compatibility with Blender 4.2 LTS and newer, so it should run on the current LTS release and versions released after it. Its most recent version is 1.0.1, published in April 2025. Because compatibility with builds below 4.2 is not indicated, users on older Blender versions should check the developer's page before installing. The add-on is distributed under the GNU General Public License v3.0 or later and requires no special permissions.
Import Export Skin Weights offers two mapping methods when reimporting weights between meshes. Position mode maps by closest vertex position, matching each vertex to the nearest one on the target. UV mode maps using vertex UV coordinates instead. The tool works best with meshes that share the same topology or the same UV, and reimport targets should use the same hierarchy skeleton. You choose the mapping method during import, after selecting the target mesh and before loading the JSON file.
Import Export Skin Weights follows a straightforward workflow. To export, select a mesh, use the Export button, and save the JSON file to a folder. To import, select the target mesh, choose a mapping method, use the Import button, and locate the JSON file. The exported JSON captures the vertex groups, UV positions, and influences of the selected mesh. A demo video is available on the developer's page, and the add-on supports Blender 4.2 LTS and newer.
Import Export Skin Weights is listed as free here in the catalog, and it is released under the GNU General Public License v3.0 or later. The add-on states that it requires no special permissions to run. For current licensing terms and any changes, check the developer's page on GitHub, where the source is available. The extension is a small download and integrates with Blender 4.2 LTS and newer.
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