Supported 3D File Formats: GLB, OBJ and STL

GLB is the binary container format for glTF, increasingly known throughout the industry as the "JPEG of 3D". What makes the GLB format uniquely powerful is its ability to bundle complex 3D data — including the vertex geometry, full UV maps, and high-resolution PBR textures — into a single, compact, and highly efficient file. This self-contained structure eliminates the common headache of missing texture maps or broken material linkages when moving assets between different systems.

Because GLB files are highly compressed and load incredibly fast, they are the undisputed standard for modern web visualization, augmented reality integrations, and lightweight mobile applications. When you generate a 3D model using Hi3D's image to 3D capabilities, the resulting GLB perfectly preserves the cleanly baked albedo and surface properties interpreted by the AI. Depending on the complexity of the geometry, typical file sizes from our generator range from a very lean 2 MB up to 15 MB.

You should always choose the GLB format if your final destination involves real-time rendering. Software like Unity, Unreal Engine, Godot, and web-based libraries such as Three.js ingest GLB files natively and flawlessly, maintaining the exact visual fidelity you previewed in our browser window. It provides an immediate, out-of-the-box solution for game developers and digital marketers alike.

The OBJ format, developed originally by Wavefront Technologies, has served as a foundational standard in the 3D graphics industry for decades. Unlike the unified GLB format, exporting an OBJ from Hi3D yields a multi-file package. You will receive the core .obj file which stores the pure polygon mesh data and UV coordinates, alongside a corresponding .mtl (Material Template Library) file, and a separate image file acting as the texture map. This separation of data provides deep, granular access to the asset's individual components.

This modular file structure makes OBJ files slightly larger and slightly more cumbersome to manage, but it offers unparalleled compatibility and flexibility. Because the texture map is isolated as a standard image file, you can easily open it in a raster editor to manually adjust the albedo or paint custom details directly onto the UV layout. The geometry itself is stored as a plain text-based list of vertices and faces, which practically every legacy and modern 3D application can read without issue.

OBJ is the format of choice when your image to 3D output requires further manual refinement. If you plan to import the generated 3D model into traditional digital content creation software like Blender, Maya, or ZBrush to perform advanced retopology, sculpt additional fine details, or bake custom normal maps, OBJ provides the stable, widely-supported foundation you need.

STL (Stereolithography) is an entirely different class of format, uniquely dedicated to defining raw, unadorned surface geometry. An STL file contains absolutely no information regarding color, materials, UV maps, or textures; it describes the 3D model strictly as a collection of interconnected triangular facets. This hyper-focus on pure volume and shape makes it the absolute, undisputed industry standard file format for additive manufacturing.

The AI 3D model generator powering Hi3D is specifically optimized to produce mathematically robust STL files. By ensuring that the generated topology is manifold and completely watertight — meaning it lacks any non-manifold edges, inverted normals, or structural holes — the STL output is functionally slicer-ready. Because texture data is intentionally omitted, the file sizes remain manageable even for highly detailed meshes.

You should select the STL export whenever your goal involves physical fabrication. Whether you are using Fused Deposition Modeling with filament or Stereolithography with liquid resin, slicing software like Bambu Studio, UltiMaker Cura, PrusaSlicer, and OrcaSlicer demand reliable STL geometry to calculate accurate G-code toolpaths, layer heights, and support material structures.

While Hi3D provides the three most essential formats natively, you may occasionally require a format like FBX or DAE for specific rigging or animation pipelines. Fortunately, converting between these formats is a straightforward process. You can simply download the highly compatible OBJ or GLB file from Hi3D and import it into a free, robust open-source tool like Blender. From there, you can use Blender's built-in export dialogue to convert the 3D model into virtually any industry format you need, preserving the original geometry and texture mapping intact.

One rule survives every conversion: you can always throw information away, but you can never get it back. Going from GLB to STL is lossless in the only sense that matters, because STL never carried texture data to begin with — the geometry arrives intact. Going the other direction is not possible; an STL cannot be converted into a textured asset, because the colour information was discarded at export. If you think you may need both a printable and a renderable version, download the GLB and derive the STL from it rather than the reverse.