Free Online STL to X Converter

You can use our STL to X 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 STL to X converter will process each 3D model and present you with a download link for each file once completed.

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 STL file, once uploaded to our server, will be deleted 15 minutes after upload, so please download your converted STL file before this time.

Our 3D model STL to X tool will load your STL 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 STL to X Online?

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

Upload your STL file

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

Download your X

Click the download link to receive your X file.

Frequently Asked Questions

How can I convert my STL file to X?

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

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

We aim to process all STL to X 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 STL to X 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 STL to X work?

In order to successfully convert an STL formatted file to the X format, our converter tools will perform several initial checks to ensure the file provided is indeed an STL 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 STL files to the exact specification.

Take your STL file

The STL file format can be either a text-based or binary format, meaning if its content is plain text, it is human-readable; otherwise, if it is binary, then it can only be edited with specialist STL editing software. The data within the file, regardless of whether it is text or binary, is structured in a very simple manner. A 3D model is composed of many triangles, with each triangle comprising 3 vertices. The STL format is simply a sequential list of triangle vertices, which can lead to duplicated data. To guarantee efficient conversions, our tool will check all data that is contained within the STL file and remove any information that is duplicated. This not only ensures the conversion completes more quickly but also that the generated X is smaller.

Convert the data from STL to X

Now that the data from the STL 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 X file format. Part of this process ensures checking the capabilities of the X format and removing any data that cannot be represented.

Save to the X format

At this point, the STL to X conversion tool will have the 3D model in a state that is ready to be transferred to the X format. Our tool creates the X file, ensuring all the model data is present and is formatted to match the X file specification to ensure the file opens in compatible X file editors.

File format information for STL and X

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 modelling 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 flavours: 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 3D model or mesh files using our STL converter, we will attempt to convert colour materials into a suitable format for use in the converted file.

Extension	X
Full Name	Direct X File
Type	3D Model
Mime Type	text/plain
Format	Text

The X file format is the legacy format used by the Microsoft Direct X suite of components and tools. Specifically, X files are used to store hierarchical 3D objects along with their associated material, texture, lighting, and animation data.

The 3D data is stored as plain text in the X file, allowing for manual editing within a simple text editor. 3D mesh surfaces are defined using a series of vertex coordinates and joined with lists of face indices. Along with these are optional normal and texture coordinates for textured surfaces; the textures themselves are often stored as external files using the DDS file format.

As mentioned previously, the X format is a legacy format and is no longer widely supported, with developers preferring to use modern formats such as FBX instead. That said, some 3D modelling applications still support importing and exporting to the X format.

X Converter Capabilities

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

Information for converting from STL to X

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