Large Image Files get cut off when converting to normals

[Kaiba12]

When you upload an image such as a 4k or an 8k texture map, the image will get virtually cut almost in half size wise, and throws off anything the UV map does to an actual 3D model

[cpetry]

Can you please check your JavaScript console in your browser? In case of warnings or errors please attach the log.

Did you try other browsers? You mentioned this happens in Firefox. As I can‘t test it on my side can you please also check chrome?

[cpetry]

Could be a hardware or browser max texture limit:

AI generated:
✅ Likely Cause: Maximum Texture Size Limit
Most GPUs (especially on mobile or integrated graphics) have a maximum texture size — often 4096×4096 or 8192×8192, though newer GPUs can go higher. When you try to use glCopySubTextureCHROMIUM on a texture larger than this limit, WebGL internally rejects it, triggering:

GL_INVALID_VALUE: glCopySubTextureCHROMIUM: The specified dimensions are outside of the bounds of the texture.

I remember some kind of limit when I created NormalMapOnline.