to
Our free and fast tool will convert most 3D mesh or CTM (OpenCTM) model files to a standard GLB (Graphics Language Transmission Format) file that can then be edited further in most popular 3D editing packages such as Blender or 3D printed without any further processing. Our conversion tool can also batch convert multiple CTM files; up to 25 files at a time can be converted.
To convert your CTM file, click the Upload button above and select the file to convert. Once selected, the file will be converted to a GLB file and will be ready for download shortly afterwards. For more information about the CTM to GLB conversion process, see the conversion information section below.
| Extension | CTM |
| Full Name | OpenCTM |
| Type | 3D Model |
| Mime Type | application/x-ctm |
| Format | Binary |
| Tools | CTM Converters, 3D Model Voxelizer, Create CTM Animation, Text to CTM, CTM Viewer |
The CTM file format is a 3D triangle mesh format that contains 3D geometry such as vertices, faces, and face normals. The format was devised and released in 2010 with the intention of creating 3D models that could be compressed and easily distributed.
The compression methods employed by the CTM format can be lossy or lossless. The lossy compression will attempt to simplify the mesh vertices to reduce the space needed to store them, while the lossless method employs the LZMA compression library. The format has its own dedicated CTM viewer application, though the format is not well supported by other 3D modeling applications.
If your CTM file contains vertex colors, these will be imported and mapped where possible.
| Extension | GLB |
| Full Name | Graphics Language Transmission Format |
| Type | 3D Model |
| Mime Type | model/gltf-binary |
| Format | Binary |
| Tools | GLB Converters, 3D Model Voxelizer, Create GLB Animation, GLB Asset Extractor, Text to GLB, GLB Viewer |
| Open With | Blender, MeshLab |
The GLB file format, which can also have the GLTF file extension depending on whether the content is binary or text/JSON, is a 3D file format used to describe 3D worlds and, as such, contains geometric data such as vertices, faces, normals, animations, and other 3D scene-related data.
The format, described by its creators as the "JPEG of 3D", has gained in popularity and is supported by a wide range of 3D modeling applications such as Blender and MeshLab. The GLB format is an open standard that is maintained by the Khronos Group.
If your original model file contains texture images and other texture-related data, these will be included in the final GLB file.
Converting from the CTM file format to GLB can be a complex process, and any tool used for this conversion process needs to be able to handle a variety of data conversion tasks as well as identify any defects within the 3D model and fix them. Here we will explain the conversion process used by our tool to accurately convert your CTM file to a valid GLB 3D model. Let's start with the conversion process, which involves the following steps:
In its simplest form, an CTM file is a binary data file containing 3D data such as vertices, faces, normals, and more. When combined, these make up the 3D model you see on your screen.
For more information regarding the CTM file format, please see this great article that goes into a lot of detail explaining the CTM format.
With the CTM file data read, our tool generates an internal representation of the full 3D model and will attempt to fix any geometry issues encountered. Along with repairing any issues with the 3D model, the tool will remove any duplicated vertices and prepare the model for exporting to the GLB format.
With the conversion process entering its final stages, our tool now needs to take the in-memory 3D model we have created in step 2 and convert it to the GLB format.
Yes! Our CTM tool supports full batch conversions. You can upload up to 25 and CTM files at a time. Our tool will convert them all as quickly as possible. Once completed, you can either download the GLB files individually or download them all in a single ZIP file.
First click the "Upload..." button, select your CTM file to upload. Select any configuration options. When the CTM to GLB conversion has completed, you can download your GLB file straight away.
We aim to process all CTM to GLB conversions as quickly as possible, this usually takes around 5 seconds but can be more for larger more complex files so please be patient.
We aim to create the most accurate conversions with our tools. Our tools are under constant development with new features and improvements being added every week.
Yes, of course! We do not store the CTM file you submit to us. The resulting GLB file, once created is deleted 15 minutes after upload and the download link will expire after this time.
No. All our conversion tools process your CTM file on our dedicated conversion servers, meaning you can use our tools on low-spec computers, laptops, tablets, and mobile devices and receive your converted GLB file quickly.
Yes! Our CTM to GLB tool will run on any system with a modern web browser. No specialist software is needed to run any of our conversion tools.
Yes. Although you can use an Ad Blocker, if you like our CTM conversion tool please consider white-listing our site. When an Ad Blocker is enabled there are some conversion limits on some of our tools and processing/conversion times will be longer.
Yes. When you have converted your CTM to GLB, there is a "Feedback" option that you can use to let us know of any issues you encountered when converting your file.
© 2025 ImageToStl. Convert your PNG and JPG Files to 3D STL files.
