# 3DS to STL Converter

> Print legacy 3D Studio models: 3DS to STL with all meshes merged into one printable file.

Page: https://printpal.io/convert/3ds-to-stl
Updated: 2026-11-12
Use it: open https://printpal.io/convert/3ds-to-stl in a browser and drop a file. Free, no account, files are processed locally and never uploaded.

The 3DS format splits large models into many meshes because of its 65,536-vertex limit. The converter merges them into one STL and keeps 3DS's Z up, which matches the slicer.

3DS stores no units, so the numbers pass through as millimetres. If the model comes out the wrong size, set the file units or a target height.

## How to convert 3DS to STL

1. **Drop your 3DS files.** Drop .3ds files with their texture images.
2. **Check the preview.** The model appears at the size and orientation it will have. Fix the file units, up axis or size under Size, units and orientation if needed.
3. **Choose STL options.** Binary STL by default (smallest, read everywhere). Tick ASCII only if an old tool asks for text STL.
4. **Convert and download.** One file downloads straight away. A batch gives a download per file and one .zip of all of them.

## What carries over

| | Result |
|---|---|
| Geometry | Every face is kept; quads and n-gons are split into triangles. |
| Color | Dropped: STL cannot store color. |
| Units | 3DS has bare numbers, so they pass through as millimetres: 1 unit becomes 1 millimetre. If the preview size is wrong, set the file units. |
| Orientation | Both are Z up, so it stays the right way up. |
| Objects | Merged into one surface: STL has no objects. |

## 3DS at a glance (3D Studio mesh)

3DS is the native format of the DOS-era Autodesk 3D Studio. Its 16-bit limits make it obsolete, but large libraries of older models still ship as .3ds.

- **Stores:** Binary chunks: meshes, materials, texture names
- **Color:** Materials and textures
- **Units:** None stored in the mesh
- **Up axis:** Z
- **Limits:** 65,536 vertices per mesh, 8.3 texture file names
- **Opens in:** 3ds Max, Blender (add-on), many legacy tools

## STL at a glance (Stereolithography (Standard Triangle Language))

Created by 3D Systems in 1987 for the first stereolithography printers, STL is still the format every slicer and print service accepts. It describes a surface as a list of independent triangles, with no shared vertices, units, colors or scene structure.

- **Stores:** Loose triangles: three corners and a normal each, binary or ASCII
- **Color:** None in the standard
- **Units:** None written; slicers assume millimetres
- **Up axis:** Z, the slicer convention
- **File size:** 50 bytes per triangle in binary, about 5 times that as ASCII
- **Opens in:** Every slicer, CAD tool and 3D app

## Tips

- **Check closure** Old game and archviz models often aren't watertight. Check before printing.
- **Set a size** Use the height option for a known print size.
- **Keep textures** Convert to GLB instead to keep the textures.

## FAQ

### Why is my 3DS model the wrong size?

3DS has no units. Set the file units or a target height.

### Are textures kept?

Not in STL. GLB or OBJ keep them.

### Can I convert many 3DS files?

Yes, drop them all or a .zip.

### Is the converter free? Are there limits?

Free, with no sign-up, watermark or file count limit. Batches and files of a few hundred MB work on most laptops; the only limit is your device's memory.

### Are my files uploaded?

No. Files are read and written by JavaScript and WebAssembly in your browser and never sent to PrintPal. The STEP and IGES reader is the only extra download, once, from a public CDN.

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