An FBX file stores 3D models, animations, and scene data in a format that works across different software

FBX stands for FilmBox. It is a file format created by Autodesk that holds 3D geometry, skeletal animations, textures, lighting, and camera information in a single package. Think of it as a container that lets you move a 3D character or object from one program to another without losing the rigging, movement data, or material settings.

The format became the industry standard because it preserves more information than simpler 3D formats. When a game developer exports a character from Maya, an animator can import that same FBX into Unreal Engine and the bones, weights, and animation curves come along. Without FBX, you would have to rebuild those details in the new software.

FBX files end with the .fbx extension. They are binary files, meaning they are not human-readable text — you open them in 3D software, not a text editor.

Key Takeaways

  • FBX files contain 3D models, animations, bones, textures, and scene setup information that transfer between different software programs.
  • The format is widely supported in game engines like Unity and Unreal Engine, 3D modeling software like Blender and Maya, and animation tools.
  • FBX preserves rigging and animation data, so a character animated in one program can be imported into another without rebuilding the skeleton.
  • You cannot open or edit an FBX file in a standard text editor or image viewer — you need 3D software designed to read the format.

What information an FBX file actually contains

An FBX file can hold geometry (the shape of the object), materials (color and texture settings), skeletal rigs (the bones inside a character), animations (movement data tied to those bones), and metadata about cameras and lights in the scene.

Not every FBX contains all of these. A simple static model might only have geometry and materials. A character for a video game usually includes the mesh, a full skeleton with weight painting, and multiple animations like walking, running, and jumping. A cinematic export might include camera movement and lighting setups.

The software that created the FBX decides what gets saved. If you export from Blender without animations, the FBX will not contain animation data even though the format supports it. When you import that FBX into another program, you see only what was exported.

Which programs can open and edit FBX files

FBX support is built into most professional 3D software. Autodesk Maya, 3ds Max, and MotionBuilder all read and write FBX natively. Blender, the free open-source 3D suite, has FBX import and export. Cinema 4D, Houdini, and LightWave 3D all support the format.

Game engines including Unity, Unreal Engine, and Godot can import FBX files directly into your project. When you drag an FBX into the project folder, the engine reads the geometry, materials, and animations automatically.

Some software has better FBX support than others. Maya and Unreal Engine handle complex rigs and animations with fewer problems. Blender's FBX support is functional but occasionally loses material settings or animation curves during import, so many artists export from Blender to FBX and then re-import to check what survived the conversion.

FBX versus other 3D file formats

Other common 3D formats include OBJ, GLTF, USDZ, and Collada. Each has different strengths. OBJ is older and simpler — it holds geometry and basic materials but no animations or bones. GLTF is newer and lighter, designed for web and real-time use. USDZ is Apple's format for augmented reality. Collada is an older interchange format that some software still supports.

FBX remains the choice for character animation and game development because it preserves skeletal rigs and animation data reliably. If you are moving a rigged character between software, FBX is usually the safest choice. If you are sharing a static model for 3D printing or web viewing, OBJ or GLTF might be simpler.

Many artists export to multiple formats depending on where the file is going. A character might be FBX for the game engine but OBJ for a 3D printing service. A product model might be GLTF for a website but FBX for internal studio work.

How to export a file as FBX

In most 3D software, you go to File > Export or File > Export As, then choose FBX from the format list. The software then shows export options — checkboxes for whether to include animations, materials, cameras, and lights.

In Blender, select the objects you want to export, then File > Export > Autodesk FBX. In Maya, File > Export Selection or File > Export All. In Unreal Engine, you right-click an asset and choose Export. The exact steps vary by software, but the concept is the same: choose FBX format and decide what to include.

Export settings matter. If you forget to check "Bake Animation" or "Include Armature," the receiving software will not see the animation or bones. Most software remembers your last export settings, so if you export the same type of file repeatedly, you set the options once and reuse them.

Common problems when opening FBX files

The most frequent issue is missing materials or textures. FBX stores material names and settings, but the actual image files (the texture maps) are separate. If you move an FBX to a new computer or send it to someone else, the textures do not come along unless you also copy the texture folder. The receiving software sees the material slots but finds no image files to load.

Animation data sometimes does not transfer cleanly between software. A walk cycle exported from Maya might import into Unreal Engine with slightly different timing or with some keyframes missing. This usually happens when the software interprets animation curves differently or when export settings do not match import settings.

Bone weights and rigging can shift if the receiving software uses different calculation methods. A character that looks correct in Maya might have loose or pinched geometry in Blender because the weight painting was interpreted differently. Testing the import in the destination software before committing to the workflow prevents surprises later.

When you would use an FBX file

Game developers use FBX constantly. An animator creates a character in Maya, exports it as FBX with all animations baked in, and the game programmer imports it into Unity or Unreal Engine. The character's skeleton, weights, and movement data arrive intact.

Visual effects studios use FBX to move models between software. A modeler in Maya creates a character, a rigger adds bones and controls, an animator creates the performance, and then the FBX goes to the effects department to add cloth simulation or particle effects in a different program.

Freelancers and studios exchange FBX files as deliverables. If a client needs a 3D character, the artist delivers an FBX because it works in almost any software the client might use. It is the closest thing to a universal format for rigged, animated 3D content.

Frequently Asked Questions

Can I open an FBX file on my phone or tablet?

Not with standard software. FBX is a professional format designed for desktop 3D software. Some mobile apps can view 3D models, but they usually require GLTF or USDZ format instead. If you need to view an FBX on a phone, convert it to GLTF or USDZ first using desktop software.

Why does my FBX file lose textures when I import it?

FBX files reference texture images but do not contain them. When you move the FBX to a new location or send it to someone else, the texture folder must come along. Check that all image files are in the same folder structure as when they were exported, or re-link the textures in the importing software.

Is FBX the same as a 3D model file?

FBX is one type of 3D model file, but not the only one. OBJ, GLTF, USDZ, and Collada are also 3D formats. FBX is chosen specifically when you need to preserve animations and skeletal rigs. A static object might use OBJ or GLTF instead.

Can I edit an FBX file in a text editor?

No. FBX is a binary format, not text. Opening it in a text editor shows unreadable characters. You must use 3D software like Blender, Maya, or a game engine to open and modify FBX files.

What version of FBX should I export?

Most software defaults to FBX 2020 or later, which is compatible with current game engines and 3D tools. Older versions like FBX 2016 still work but may lose some data. Unless the receiving software specifically asks for an older version, use the newest version your software offers.