Convert Your 3D Mesh/Model OBJ Files to OFF

Our free and fast tool will convert most 3D mesh or OBJ (Wavefront) model files to a standard OFF (Object File 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 OBJ files; up to 25 files at a time can be converted.

To convert your OBJ file, click the Upload button above and select the file to convert. Once selected, the file will be converted to a OFF file and will be ready for download shortly afterwards. For more information about the OBJ to OFF conversion process, see the conversion information section below.

How to Convert your OBJ to OFF Online?

Here are two simple steps to convert your OBJ to OFF.

Upload a OBJ

Click the "Upload a OBJ File" button and select a OBJ to upload. The maximum file size is 100MB.

Download your OFF

Click the download link once completed to receive your OFF file.

Frequently Asked Questions

How can I convert my OBJ file to OFF?

First click the "Upload..." button, select your OBJ file to upload. Select any configuration options. When the OBJ to OFF conversion has completed, you can download your OFF file straight away.

How long does it take to convert my OBJ to OFF?

We aim to process all OBJ to OFF conversions as quickly as possible, this usually takes around 5 seconds but can be more for larger more complex files so please be patient.

How accurate is the OBJ to OFF conversion?

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.

Is it safe to convert my OBJ to OFF on ImageToStl.com?

Yes, of course! We do not store the OBJ file you submit to us. The resulting OFF file, once created is deleted 15 minutes after upload and the download link will expire after this time.

Can I convert OBJ to OFF on Windows, Linux, Android, iOS or Mac OS?

Yes! Our OBJ to OFF tool will run on any system with a modern web browser. No specialist software is needed to run any of our conversion tools.

What if I am using an Ad Blocker, will that affect things?

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.

My OBJ file contains materials and textures; how do I upload these?

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 belongs to 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.

I have several OBJ files; can I batch convert my OBJ to OFF?

Yes! Our OBJ tool supports full batch conversions. You can upload up to 25 and OBJ files at a time. Our tool will convert them all as quickly as possible. Once completed, you can either download the OFF files individually or download them all in a single ZIP file.

Comparing OBJ and OFF Features

OBJ Features

Mesh Geometry (Vertices and Faces)
Vertex Normals
Face Normals
Vertex Colors
Face Materials (Excluding textures)
Textures
Point Cloud
Multiple Objects Per File
Object Transforms (Translation, Rotation, and Scale)
Bones/Joints
Animations
Suitable for 3D Printing

OFF Features

Mesh Geometry (Vertices and Faces)
Vertex Normals
Face Normals
Vertex Colors
Face Materials (Excluding textures)
Textures
Point Cloud
Multiple Objects Per File
Object Transforms (Translation, Rotation, and Scale)
Bones/Joints
Animations
Suitable for 3D Printing

File Format Information for OBJ to OFF

Extension	OBJ
Full Name	Wavefront
Type	3D Model
Mime Type	text/plain
Format	Text
Tools	OBJ Converters, 3D Model Voxelizer, Create OBJ Animation, Compress OBJ, OBJ Asset Extractor, Text to OBJ, OBJ Viewer
Open With	Daz Studio, MeshLab, CAD Assistant

Description

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 models/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 straightforward to parse in 3D modeling applications. A downside of the text-based format is that the files can be rather large compared to similar binary formats such as STL and compressed files such as 3MF.

OBJ Notes

If your OBJ file is uploaded with accompanying MTL and texture files, these will be applied to the conversion process.

Supported Features

Mesh geometry
Materials (Via an MTL file)
Textures (PNG, JPG, TGA formats)

Extension	OFF
Full Name	Object File Format
Type	3D Model
Mime Type	text/plain
Format	Text
Tools	OFF Converters, 3D Model Voxelizer, Create OFF Animation, Compress OFF, Text to OFF, OFF Viewer
Open With	MeshLab, CAD Assistant

Description

The OFF file format is a simple text-based format capable of storing 2D and 3D geometry and was originally developed for the Geomview application. There is also an extension to the OFF format used by the Stella4D application to enable the storage of four-dimensional data.

The format can contain common vector information such as vertices, faces, shapes, and edge information, and it also has support for including color information. As the format is text-based, the files can become rather large, with no built-in compression options available.

OFF Notes

OFF files support per-face color information. If your uploaded model contains color information, our tool will attempt to save this in the OFF file at the end of the conversion process.

Supported Features

Mesh geometry
Face colors

How does it work?

Converting from the OBJ file format to OFF 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 OFF 3D model. Let's start with the conversion process, which involves the following steps:

Step 1: Read the Source OBJ File

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 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 OFF 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 OFF file, which does not support materials and textures, we will be ignoring this data if it is present in the OBJ file.

For more information regarding the OBJ file format, please see this great article that goes into a lot of detail explaining the OBJ format.

⇪

Step 2: Process File Data

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 for exporting to the OFF format.

⇪

Step 3: Saving to the OFF 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 OFF format.