Free Online GLTF to STL Converter

You can use our GLTF to STL conversion tool to quickly and easily convert your 3D model files for free. You may upload up to 20 files at one time, and our batch GLTF to STL converter will process each 3D model and present you with a download link for each file once completed.

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Select File(s)

Or drag and drop your files here to upload.
A maximum of 20 files can be uploaded at once.

Please note: Your GLTF file, once uploaded to our server, will be deleted 15 minutes after upload, so please download your converted GLTF file before this time.

Our 3D model GLTF to STL tool will load your GLTF file and, where supported, attempt to extract all the relevant 3D features, such as geometry, textures, and animations. To access the 3D conversion configuration options, click the button when you have selected your files. The current options support the ability to voxelize your 3D model and more.

How to Convert your GLTF to STL Online?

Here are two simple steps to convert your GLTF to STL using our fast and free GLTF converter tool.

Upload your GLTF file

Click the "Upload a GLTF File" button, then select a GLTF to upload. The maximum file size is 100MB.

Download your STL

Click the download link to receive your STL file.

Frequently Asked Questions

How can I convert my GLTF file to STL?

First, click the "Upload..." button and select your GLTF file to upload. Your GLTF file will be uploaded to our servers. When the GLTF to STL conversion has completed, you can download your STL file right away.

How long does it take to convert my GLTF to STL?

We aim to process all GLTF to STL conversions as quickly as possible; this usually takes around 5 seconds; however, this can be longer for certain files, so please be patient.

How accurate is the GLTF to STL conversion?

We aim to provide the best conversion experience. Our tools are under constant review and development, with new features being added every week.

How does converting GLTF to STL work?

In order to successfully convert an GLTF formatted file to the STL format, our converter tools will perform several initial checks to ensure the file provided is indeed an GLTF file. There are many files out there where the file type extension does not match the data contained within the file. Along with these file type checks, our tools will do additional checks to ensure the file is correctly formatted to match the provided file type. There are many tools out there that do not always create GLTF files to the exact specification.

Take your GLTF file

The GLTF file format is a text-based format, meaning its contents are human-readable, making GLTF files easy to edit in simple text editors. Within this text-based format are the core elements that make up the 3D model, including vertices, faces, and more. To ensure efficient conversions, our tool will check all data that is contained within the GLTF file and remove any information that is duplicated. This not only ensures the conversion completes more quickly, but also the generated STL file size is smaller.

As the STL file format does not support material textures, our tool when processing the GLTF file will ignore any texture image files that may be present. It will also ignore any texture coordinate information present in the 3D model data.

Convert the data from GLTF to STL

Now that the data from the GLTF file has been processed, our tool can apply any conversion specified options, such as enabling Voxel mode, and with these applied, prepare the data to be converted to the final STL file format. Part of this process ensures checking the capabilities of the STL format and removing any data that cannot be represented.

Save to the STL format

At this point, the GLTF to STL conversion tool will have the 3D model in a state that is ready to be transferred to the STL format. Our tool creates the STL file, ensuring all the model data is present and is formatted to match the STL file specification to ensure the file opens in compatible STL file editors. To ensure a compact file size, our GLTF to STL converter will always save the STL file in a binary format.

File format information for GLTF and STL

Extension	GLTF
Full Name	Graphics Language Transmission Format
Type	3D Model
Mime Type	model/gltf-binary
Format	Text

GLTF files are the plain text JSON equivalent of the GLB 3D file format developed and maintained by the Khronos Group. GLTF files are designed to be an open and expandable 3D format that can store 3D graphics and their assets, such as textures, animations, and more.

The content of a GLTF file is stored as plain text using a JSON data structure, which enables efficient storage of 3D modeling data. Large and complex 3D scenes can lead to inflated file sizes; where this is an issue, it is recommended to switch to the binary GLB format to help reduce the file size.

Due to their open format, GLB files are widely supported by 3D editing software. The format has gained traction amongst videogame developers and other 3D artists as a primary means of exchanging 3D data between different applications.

GLTF Converter Capabilities

When converting 3D model or mesh files using our GLTF converter, we will attempt to convert color materials into a suitable format for use in the converted file.

Extension	STL
Full Name	Standard Triangle Language
Type	3D Model
Mime Type	application/vnd.ms-pki.stl
Format	Text
Opens With	Blender, MeshLab, CAD Assistant, DAZ Studio

The STL, or Standard Triangle Language, file format has been around since the '80s and is supported by most modern 3D modeling applications. In particular, the STL format has become something of a standard format within the area of 3D printing, despite the rise of more modern formats such as 3MF.

STL files come in two flavors: binary or text format. The text format is human-readable, making it easy to perform manual edits, but can lead to very large file sizes. As you can imagine, the binary format is much more compact and represents the majority of the STL files you are likely to encounter.

The format itself is very simple; the 3D model is represented by a sequential list of triangles, with each triangle defined with 3 points consisting of their X, Y, and Z positions, along with an additional vector that contains the face normal (the direction the face is pointing). There is an additional attribute block for each triangle; however, this is largely unused and thus unsupported.

STL Converter Capabilities

When converting your GLTF to STL, our tool will attempt to accurately convert any color or material information.

Information for converting from GLTF to STL

Your GLTF file will be converted to a STL file using our unified 3D model and mesh conversion tool. Our GLTF 3D tool performs accurate conversions of 3D elements such as vertices, faces, normals, and relevant material information. As both GLTF and STL support color material information, our tool will also attempt to convert the color information.