Convert your 3D OBJ to STL file that can then be sent straight to a 3D printer or if you prefer, opened in most 3D editing applications such as Blender and many more. Our tool works with all OBJ files and will convert all 3D geometry contained within the file to STL (Standard Triangle Language). Our conversion tool can also batch convert multiple OBJ files, up to 25 files at a time can be converted.
To convert your OBJ to STL, click the Upload button above and select the OBJ file to convert. Once selected, the file will be converted to a STL file and will ready for download shortly afterwards. For more information about the OBJ to STL conversion process including what 3D model file features are supported please see the conversion information section below for more information.
Here are 2 simple steps to convert your OBJ to STL.
First click the "Upload..." button, select your OBJ file to upload. Select any configuration options. When the OBJ to STL conversion has completed, you can download your STL file straight away.
We aim to process all OBJ to STL 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 OBJ file you submit to us. The resulting STL file, once created is deleted 15 minutes after upload and the download link will expire after this time.
Yes! Our OBJ to STL 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 OBJ 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.
If your OBJ file has separate material (MTL) and texture (PNG, JPG etc.) files, you can drag and drop these onto the upload tool along with the main OBJ file. Our tool will intelligently detect which of these additional files belong with the OBJ file. Alternatively, you can place these additional files, along with the OBJ file within a ZIP or other compressed archive file and upload that.
Our tool will save all STL files in binary format. Optionally, our tool will allow you to save to the non-standard color STL format.
Yes! Our OBJ tool supports full batch conversions. You can upload up to 25 OBJ files at a time. Our tool will convert them all as quickly as possible. Once completed, you can either download the STL files individually or download them all in a single ZIP file.
Converting from the OBJ file format to STL 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 OBJ file to a valid STL 3D model. Lets start with the conversion process, which involves the following steps:
In its simplest form, an OBJ file is a plain text file containing human readable 3D data such as vertices, faces, normals and more. When combined, these make up the 3D model you see on your screen.
When our tool reads in this 3D data all we are interested in are the vertices, faces and normals as this is the only data that can be accurately converted into the final STL file.
The OBJ file can contain other data such as material definitions and textures that describe how a particular set of 3D geometry should be rendered. As we are creating an STL file, which does not support materials and textures, we will be ignoring this data if it is present in the OBJ file.
With the OBJ 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 ready for exporting to the STL format.
The STL format has been around for many years and has become a standard format for 3D printing. Most 3D printing software can open STL files which means our tool now needs to take the in-memory 3D model we have created in step 2 and convert this to the STL format.
| Extension | OBJ |
| Full Name | Wavefront |
| Type | 3D Model |
| Mime Type | text/plain |
| Format | Text |
| Tools | OBJ Converters, 3D Model Voxelizer, Create OBJ Animation, Text to OBJ, View OBJ |
| Open With | MeshLab, CAD Assistant |
The OBJ file format originally created by Wavefront Technologies and later adopted by many other 3D software vendors is a simple text-based file format for describing 3D model/geometry. This data can include Vertices, Faces, Normals, Texture Coordinates and references to external Texture files.
As the format is text-based it is relatively straight-forward to parse by 3D modelling applications. A downside of the text-based format is the files can be rather large compared to similar binary formats such as STL and compressed files such as 3MF.
If your OBJ file is uploaded with an accompanying MTL and texture files, these will be applied to the conversion process.
| Extension | STL |
| Full Name | Standard Triangle Language |
| Type | 3D Model |
| Mime Type | application/vnd.ms-pki.stl |
| Format | Text & Binary |
| Tools | STL Converters, 3D Model Voxelizer, Create STL Animation, Text to STL, View STL |
| Open With | Blender, DAZ Studio, MeshLab, CAD Assistant |
The STL file format has its roots in the 1980's and is the native file format for 3D Systems stereolithography CAD software. The format defines a triangulated mesh with vertices and faces and is a popular format for sharing 3D printable model files.
There were several formats that attempted to extend the STL format namely SolidView and VisCAM whose formats included limited 15-bit color information for each mesh face which is often ignored by most modern 3D software. The STL format can be either Text or Binary, our tools will support both formats.
The standard STL file format does not support colored faces or vertices or texture information. The STL file generated by the tool will contain only raw mesh/triangle data by default which is perfect for 3D printing.
The tool also has an option to save the file to one of the non-standard formats that support colored faces such as VisCAM and SolidView which is perfect if you want to further process the STL in software which supports these formats.
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