Drop in a model or an avatar. It is measured against the profile, its textures are re-encoded, and you get the lighter file back. Nothing leaves this page — no upload, no account, no service.
Re-encoding to WebP shrinks the download. It does nothing for video memory, because every format becomes raw pixels on the GPU — only resolution moves that number, which is why fitting the budget resamples rather than compresses harder. Geometry, skinning and animation are never touched.