Free GLB to OBJ Converter

GLB embeds textures in the binary; OBJ + MTL stores them as separate files. Common pitfalls when converting:

1. Make sure the conversion tool exports both the .obj and .mtl files plus the texture images (PNG/JPG). Meshy's export bundles them in a zip.
2. The .mtl file references textures by relative path. Keep the .obj, .mtl, and texture images in the same folder.
3. If textures still don't load, open the .mtl file in a text editor — verify the map_Kd / map_Ks / map_Bump lines reference filenames that actually exist on disk. Edit if paths are wrong.
4. PBR materials don't survive OBJ + MTL — OBJ supports only basic Phong-style materials (diffuse, specular, ambient). The metalness and roughness data from the GLB is lost.
5. For PBR fidelity, stay in GLB. Use OBJ only when the target program requires it.

For one-off conversions, Blender is the most reliable: import GLB, export OBJ with default material settings, ship the resulting bundle.

GLB → STL loses detail for two specific reasons:

1. Texture is dropped — STL stores only geometry; all surface detail captured in normal maps and color textures is lost. The mesh itself is unchanged, but visual richness disappears because there's no shader to display textures.
2. Decimation during conversion — some converters reduce polycount by default.

Workflow to preserve detail:

1. Bake the normal map into geometry — in Blender, apply a Subdivide Surface modifier and use a Displace modifier driven by the normal map. This converts texture-based detail into actual geometry.
2. Generate at high polycount in Meshy — choose Meshy-6 and Standard model type so surface detail is sculpted into the mesh from the start. Then export STL directly; you keep the geometric detail.
3. Confirm export settings — disable any decimation or simplification options during conversion.
4. Inspect both files at equal zoom — GLB renders smoother because of normals; the STL is what gets printed. To get STL detail, get it into the mesh, not just the texture.

Three approaches depending on what you mean by "texture into STL":

• Lithophane (image used as a depth map): Purpose-built tools like Lithophane Maker, ItsLitho, or 3DP Rocks. The 2D image's brightness translates directly to depth; great for portraits, photos, and grayscale art on FDM printers. Meshy's Creative Lab also offers a Lamp Generator that turns images into 3D-printable thin-shell lamps.
• Full 3D model derived from the image: Meshy's Image-to-3D. Upload the image, generate a real 3D mesh, use Remesh to optimize topology, export STL. Use this when the image represents an object you want to model in 3D (a logo with depth, a relief, a sculpt reference).
• Displacement map applied to an existing mesh: In Blender, apply a Displacement modifier to a base mesh, use the image as the displacement texture, bake to mesh, export STL. Good for hybrid workflows where you have a base shape and want to add surface detail.

For most prints, the question is whether you want a relief / depth interpretation (lithophane tools) or an actual modeled object (Meshy). Pick by intent.