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Sample FBX Files — Download Binary and ASCII FBX for Testing

FBX — Autodesk Filmbox · .fbx · MIME type application/octet-stream

2 files482 KB – 686 KBDirect linksNo ads, no sign-upFree for any useSHA-256 verified

Download a sample FBX file to test an FBX importer, a game-asset upload or an FBX-to-glTF converter. The torus knot (4,096 triangles, with per-polygon-vertex normals, indexed UVs and a Phong material) is published as both binary and ASCII FBX 7.4, written from the same node tree, so any difference in what your importer produces is down to the encoding.

FBX is Autodesk's proprietary format and has no public specification. We wrote these files from the community-documented node structure and verified that they load in three.js's FBXLoader and in Assimp. We have not tested them with the Autodesk FBX SDK, and note that Blender's importer reads binary FBX only — it rejects every ASCII FBX file, ours included.

Rendered preview of the sample FBX model
Static render of a sample on this page, flat-shaded by our generator. Open the downloads in any FBX viewer to inspect them in 3D.

Download sample FBX files

FileDetailsSizeDownload
sample-model-binary.fbx
4,096 triangles • binary FBX 7.4 • normals, UVs, Phong material • 482 KB
4,096 triangles · 2,048 vertices · normals · UVs · 1 material · centimetres, Y up482 KB
481,644 bytes
Download FBX
sample-model-ascii.fbx
4,096 triangles • ASCII FBX 7.4 • normals, UVs, Phong material • 686 KB
4,096 triangles · 2,048 vertices · normals · UVs · 1 material · centimetres, Y up686 KB
686,230 bytes
Download FBX
2 files · direct links · no sign-up · CORS enabled

Use these files from the command line or CI

Every URL is stable and CORS-open. Pin the SHA-256 in your test and you will know the moment a fixture changes.

# Download one file
curl -O https://pnb-freetoolsforweb.s3.us-east-2.amazonaws.com/samples/3d/fbx/sample-model-binary.fbx

# Verify it (SHA-256 is listed for every file above)
shasum -a 256 sample-model-binary.fbx

# Machine-readable index of every sample file
curl https://pnb-freetoolsforweb.s3.us-east-2.amazonaws.com/samples/index.json | jq '.files[] | select(.format=="fbx")'

FBX format at a glance

Full nameFBX — Autodesk Filmbox
Extensions.fbx
MIME typeapplication/octet-stream
VersionFBX 7.4 (7400)
EncodingsBinary (“Kaydara FBX Binary”) and ASCII
ContentsGeometry, Model, Material and their Connections
Units and axesCentimetres (UnitScaleFactor 1), Y up
SpecificationNone public (Autodesk proprietary)

What people test with sample FBX files

  • Game-engine and DCC asset uploads
  • FBX-to-glTF conversion pipelines
  • Binary vs ASCII FBX detection
  • Unit and axis conversion (cm, Y up)
  • Normal and UV layer mapping (ByPolygonVertex, IndexToDirect)
  • Parser robustness for an unspecified format
Testing notes. Binary FBX begins with “Kaydara FBX Binary” followed by two spaces, a NUL, 0x1A, 0x00 and a uint32 version. ASCII FBX begins with a comment line — the extension alone tells you nothing about which you have. These files have no animation, skeleton or embedded texture. For animated and skinned test models, use the GLB samples.

Frequently asked questions

Why does Blender refuse the ASCII FBX?

Blender's built-in FBX importer only supports binary FBX 7.1 and later and reports “ASCII FBX files are not supported” for any text FBX. Use sample-model-binary.fbx in Blender; the ASCII file is for testing importers, such as three.js and Assimp, that support both.

Should I accept FBX uploads?

If your users come from Maya, 3ds Max, Unity or Unreal, yes — FBX is what those tools export. Because the format is undocumented and versions differ, most web pipelines convert FBX to glTF on the server and then work only with glTF.

What units and up axis do these files use?

glTF, GLB, OBJ, PLY, OFF, DAE and USDZ are Y-up in metres (the torus knot is about 1.4 m across). STL and 3MF are Z-up in millimetres and rest on z = 0, as slicers expect. FBX is Y-up in centimetres. The units and up axis of each file are listed in its details, so you can check that your importer scales and rotates correctly.

Where do these models come from?

We generate them. A script builds the geometry from formulas (a torus knot, UV spheres, cubes, and a bracket made with a boolean modelling library), then writes each file format byte by byte from its specification. Nothing is downloaded, scanned or converted from someone else's model, which is why they are free for any use, including commercial, with no attribution.

Are these FBX files safe to download?

Yes. Every file is generated by our own open script from scratch — nothing is scraped or user-uploaded — and contains no scripts, macros or executables. The SHA-256 of each file is published on this page so you can verify what you received.

Can I use the sample FBX files commercially?

Yes. They are free for any purpose, including commercial products, test suites, demos and redistribution, with no attribution required. There is nothing to license and no one to ask.

Can I hotlink these files or use them in CI?

Yes. Every link is a stable direct URL over HTTPS with Access-Control-Allow-Origin: * and long cache headers, so curl, wget, fetch() and test runners can pull them directly. A JSON index of every file is linked from each page (see the command-line section).

Related sample files

Sample GLB filesSample DAE filesSample OBJ filesSTLOBJglTFGLBPLY3MFUSDZDAEAll 3D models →

Free tools that work with FBX

  • Hash Generator — Hash text or files with MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32, verify a checksum, or compute an HMAC. Files never leave your device.

Found a problem, or something that could be better? We read every message and we fix things quickly.

Testing a file pipeline? We build them.

Uploads, conversions, previews, document processing and media workflows are the kind of production systems FreeToolsForWeb designs and runs for clients — which is why we needed these files in the first place.

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