Free Online 3MF to STL Converter

Here is our free to use 3MF to STL 3D model converter tool that will take your 3MF file and convert it to the STL format ready for loading into your favourite 3D modeling package. Our 3D model converter supports batch processing of your files and can convert up to 20 3MF files at one time.

Drag and drop your files here to upload or click the button above.
A maximum of 20 files can be converted at once.

Please note: Your 3MF file file, when uploaded to our server, will be deleted 15 minutes after upload. Please download your converted 3MF file file before this time.

The 3MF to STL model conversion tool will analyse your 3MF file and convert its 3D mesh data including vertices, surfaces and where applicable vector normals and texture coordinates to the STL format whilst maintaining the structural accuracy of your original 3MF 3D model file.

File information for 3MF and STL

Full Name3D Manufacturing Format
Type3D Model
Mime Typeapplication/

The primary purpose of the 3MF format is to store and transmit 3D models for 3D printing. The format is ideally suited to this due to its ability to store not only the 3D model but also additional metadata required for 3D printing an object, such as units of measurement, surface material characteristics, and more.

Mesh Geometry

The 3MF file format is a mesh-based format; more specifically, the mesh is stored as a series of triangles that, when combined, can represent any 3D object. The format can contain many 3D mesh objects in a single file.

3MF Converter Capabilities

As materials containing texture and color information are both supported by the 3MF format, our tool will do its best to include these materials, including any texture files, in the converted file.

Full NameStandard Triangle Language
Type3D Model
Mime Typeapplication/

The STL file format is used for storing 3D models and is a common format for distributing 3D printable models. STL files emerged in the 1980s as a format for storing a 3D mesh as a simple list of triangles. Due to its age and simplistic format, it has gained widespread support within 3D modeling and CAD applications.

As a result of the simple file format and its widespread support amongst 3D editors, the STL format has found itself as the format of choice for the distribution of 3D printable objects. There are many websites that offer 3D printing downloads in the STL format.

Mesh Geometry

As mentioned, STL files make use of a simple structure for containing the 3D mesh data. The 3D model is stored as a continuous list of triangles, with each triangle containing three vertices specifying the location in 3D space of the triangle, which, along with a single vector normal, is all that is required to render the model contained within the STL file. There are two formats of STL files: plain text and binary. When used with large and complex 3D models, the text format leads to very large file sizes and should be avoided, with the binary format offering more efficient storage of the mesh data.

STL Converter Capabilities

As materials containing color information is supported by the 3MF and STL formats, our tool will do its best to include this in the converted STL file.

How to Convert your 3MF to STL?

Here are two steps to convert your 3MF to STL using our free 3MF converter tool.

Upload your 3MF file

Click the "Select File" button, and then select the 3MF file to upload. The maximum file size is 100MB.

Download your STL

Click the download link to receive your STL file.

Frequently Asked Questions

How do I convert my 3MF to STL?

First, click the "Select File" button and choose your 3MF file. We will upload and convert your 3MF file. Once the conversion from 3MF to STL completes, use the provided link to download your STL file.

How long does it take to convert my 3MF file to STL?

We aim to process all 3MF to STL file conversions as soon as possible; this should take around 5 seconds; however, this may be longer for larger files.

Is the 3MF format suitable for 3D printing?

Yes. 3D printing slicer software generally supports the 3MF format without the need for conversion.

© 2024