Repair your STL Online

Do you have a STL 3D model file that will not open correctly? If so, our free-to-use STL 3D model repair tool may be able to help. Our tool analyses the content of your STL file and is able to determine if the file structure and content (i.e., vertices, faces, and materials) are valid. Our tool will let you know what is wrong with your STL 3D model file and attempt to fix it.

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

Please note: Your STL, once uploaded to our server, will be deleted 15 minutes after upload.
If our tool offers the option to repair your file, please ensure you download the repaired file within this time period.

How to Repair your STL Online?

Here are 3 simple steps to repair your STL using our fast and free repair tool.

Upload your STL

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

Analysis and Repair

Your STL file will be analysed, and our tool will attempt to repair your STL file if possible.

Repair or Convert your STL

Select an option to either repair or convert to receive your repaired STL file.

Frequently Asked Questions

Will the quality (vertices or faces) be affected?

Our STL repair tool will not intentionally reduce the number of vertices or faces in your 3D model.

Is it free to use the STL file repair tool?

Yes! Our STL repair tool is 100% free to use.

Are there any usage limits when repairing my STL file?

No, you can repair as many files as you wish. We do not have any limits when using our STL repair tool.

How long does it take to repair my STL?

We aim to process STL repairs as quickly as possible; this usually takes around 5 seconds; however, this may be longer depending on the file size and data needed to be repaired.

What does the STL repair process involve?

Once your STL has been selected, it will undergo some initial checks to verify that the file has some basic information. If the initial checks pass, we then upload the file to our servers for more detailed analysis.

Is it safe to repair my STL on FabConvert.com?

Yes, of course it is! Your STL, once repaired, is deleted 15 minutes after upload, and any download link will expire after this time.

Can I repair my STL on Windows, Linux, Android, iOS or Mac OS?

Yes! Our STL repair tool will run on any system with a modern web browser.

STL file format information

ExtensionSTL
Full NameStandard Triangle Language
Type3D Model
Mime Typeapplication/vnd.ms-pki.stl
FormatText
Opens WithBlender, 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.

Repairing a STL File

STL 3D Model File Header Data

As is common amongst 3D model file formats, STL file formats may contain data within their header to help identify the type of file should the filename extension prove to be inaccurate or missing. With the header data from the STL 3D model file, we are able to determine core information such as object count, vertex count, faces, textures, and other information, which can then be used to check the validity of the file.

Vertices, Faces and Geometry

This data forms the core element of any STL model and, if damaged, cannot be easily recovered. Our STL repair tool will try its best to repair and reconstruct any 3D model file it detects to be missing geometric data.

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