# FBX to STL converter

The FBX to STL converter reads a binary or ASCII FBX in your browser and writes one binary STL for a slicer. The unit the FBX declares becomes millimetres, the model is turned Z-up, and a print height of 28, 50, 100 or 180 mm can be set; textures, materials and animation are left behind.

> Canonical: https://ai3d.studio/fbx-to-stl

## FBX to STL in numbers

### 10 mm per FBX centimetre

The unit the FBX declares is read and written as millimetres, the unit slicers assume for STL.

### 758 mm tall at original size

The sample chest is 75.81 cm in its FBX, so kept at its true size it is taller than most print beds; a print height fixes that.

### 0 animation clips kept

An STL is one still shape: clips and bones are dropped and the mesh is written in its rest pose.

### 250 MB per file

The largest FBX the page opens; it is read inside the browser tab and 0 bytes are uploaded.

## Two FBX files through the FBX to STL converter

Read back from the downloaded STLs at Original size.

### The chest: 2.6 MB of FBX, 1.3 MB of STL

26,942 triangles became a 1,347,184-byte binary STL, 832.23 × 519.30 × 758.07 mm, with its 75.81 cm height now on the Z axis.

### A dancing character in a T-pose

A rigged character with 2 animation clips came out as 55,320 triangles in its rest pose, 1,946.85 mm wide with the arms out, not in any frame of its dance.

### Everything else stayed behind

For both files the carry-over list reported the UV layout, the normals, the materials and the textures as not written.

## What survives FBX to STL

Only the shape reaches the slicer.

### Every mesh's triangles

Kept

### Materials, textures and UVs

Dropped

### Smooth vertex normals

Dropped

### Animation and skeleton

Dropped

### Unit and up axis

Changed

## What an FBX model needs before it prints

FBX files are built for engines and animation, so a few things decide whether the STL slices cleanly.

### A size in millimetres

FBX files are usually in centimetres at real-world scale, so a character arrives a metre or more tall; choose a print height on the page.

### A pose that stands

A rigged character exports in its bind pose. Arms held straight out print as long overhangs that need supports.

### Surfaces with thickness

Game meshes often use single planes for hair, cloth or leaves, which have no volume to print and may leave the model open.

## Convert an FBX to STL in three actions

The page opens with STL picked; the print height is the only choice left.

### Drop the FBX

Pick the .fbx. The page reads its unit and shows the triangle count and the size it would print at.

### Pick a print height

Choose 28, 50, 100 or 180 mm, or keep Original size when the FBX is already modeled at print scale.

### Convert to STL

The binary .stl saves to your device with the height in its file name, ready for the slicer.

## Limits of FBX to STL conversion

The STL is exactly the shape the FBX held, flaws included.

### Not checked for watertightness

Holes, flipped faces and open edges are copied as they are; run STL repair before slicing when the model was made for a screen.

### The bind pose only

No frame of an animation can be picked. Pose the character in the source program and export that mesh to print it posed.

### One merged file

Every mesh lands in a single STL; cut it into parts afterwards when pieces must print separately.

### No color in the print file

For a multicolor print, open the textured FBX in the texture to vertex color tool, which writes a 3MF with filament colors.

## What to run on the STL next

Make the converted shape printable, then size and split it.

### [Repair for printing](https://ai3d.studio/repair-3d-model-for-printing)

Close holes and fix inside-out faces so the slicer sees a solid.

### [Add a base](https://ai3d.studio/3d-print-base-generator)

Stand a figure on a plinth, mini base or pedestal, joined into one solid.

### [Split for printing](https://ai3d.studio/split-3d-model-for-printing)

Cut a large model into pieces that fit the bed.

### [Multicolor 3MF](https://ai3d.studio/texture-to-vertex-color)

Open the textured FBX there for a 3MF with 1 to 16 filament colors.

### [FBX to OBJ](https://ai3d.studio/fbx-to-obj)

Keep the color texture instead: an OBJ, its MTL and PNG images in a ZIP.

## Questions about FBX to STL

Answers about size, pose, color and printability.

### How do I convert an FBX to STL?

Drop the .fbx on the converter, pick a print height or keep Original size, and press Convert to STL. A binary STL in millimetres saves to your device.

### What size is the STL after FBX to STL conversion?

The real size unless you pick a height. The converter reads the FBX unit, usually centimetres, and writes millimetres, so a 75.81 cm chest becomes a 758.07 mm STL; choosing 100 mm scales it to fit a printer.

### Why does my character print in a T-pose after FBX to STL?

STL has no animation or skeleton, so the converter writes the mesh in the pose its bones were bound in, which for most rigged characters is a T-pose or A-pose.

### Does FBX to STL keep colors?

No. STL stores triangles only, so materials and textures are dropped. A multicolor print needs a 3MF made from the textured model.

### Will the STL from FBX to STL be printable?

Only if the FBX mesh is closed and thick enough. Models made for games often have open edges or single-sided planes; STL repair closes holes before slicing.

### Who uses FBX to STL, and for what?

Makers printing a figure or prop from a game engine, an animation package or an asset store that ships FBX, and tabletop players printing characters. Assets built for a screen usually need repair and a base before they print well.

### Is FBX to STL conversion free and private?

Yes. The FBX is read and the STL is written in your browser tab, with no account, no credits and 0 bytes uploaded.

### Can I use what FBX to STL makes commercially?

Every plan, the free tier included, lets you use what FBX to STL makes commercially: the outputs generated for you are yours.

### How does FBX to STL compare, and what alternatives fit a different workflow?

FBX to STL: Convert FBX to STL free in your browser: centimetres become millimetres, the model turns Z-up for the slicer, and you can set a print height of 28 to 180 mm. Related options are AI 3D model editor: AI 3D model editor for a mesh you already have: upload GLB, OBJ, FBX or STL up to 200 MB, then retexture, remesh, rig or segment it. From 25 credits a tool, GLB Compressor: Free GLB compressor: meshopt or Draco geometry, WebP, JPEG or PNG textures resized to 512–4096 px, optional simplification. Runs in your browser, no upload, STL to OBJ: Convert STL to OBJ free in your browser: binary or ASCII STL in, an OBJ and MTL out, stood Y-up and scaled from millimetres to metres. Nothing is uploaded, 3D Turntable Video: Free 3D turntable video maker: spin a GLB, FBX, OBJ or STL through 360° and download a looping MP4 or a transparent WebM, up to 4K and 60 fps, FBX to OBJ: Convert FBX to OBJ free in your browser: the OBJ, its MTL and the FBX's color textures as PNG files come in one ZIP, in metres. Nothing is uploaded, and UV Unwrap: UV unwrap a 3D model free in your browser: automatic seams and packing, your textures baked onto the new layout, or lightmap UVs. GLB out. Choose by the required input, delivered output, controls, limits, current availability, and credit cost; the related-tools section links each canonical page.

## Convert an FBX to STL now

Drop the .fbx above, pick a height and save the STL.

## Related tools

### [AI 3D model editor](https://ai3d.studio/ai-3d-model-editor)

### [GLB Compressor](https://ai3d.studio/glb-compressor)

### [STL to OBJ](https://ai3d.studio/stl-to-obj)

### [3D Turntable Video](https://ai3d.studio/3d-turntable-video)

### [FBX to OBJ](https://ai3d.studio/fbx-to-obj)

### [UV Unwrap](https://ai3d.studio/uv-unwrap)

_Last updated October 8, 2026_