You cannot exactly convert a 2D raster image (like .jpg pictures) to a 3D object (.obj). However, some tools allows users to apply the picture and a texture to a 3D mesh represented by the .obj file. Typically done with a 3D modeling tool or editor.
Convert JPEG bitmap image format to 3D object graphics.
We have found 6 software records in our database eligible for .jpg to .obj file format conversion.
Microsoft Windows software - convert jpg to obj on Windows
A 3D CAD translation softwate
Convert from jpg file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned jpg to obj. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A texture mapping utility
PMD, PMX, X MikuMikuDance model editor
A 3D general-purpose modeling program
An application for the planning of spaces and furnishings
Apple macOS / Mac OS X software - convert jpg to obj on OS X
3D modeling and animation package for Mac.