Recommended File Formats for Sharing CAD Designs (2026 Updated)

Last Updated 7/16/2026

Whether you're looking to get a part produced, quoted, modified, 3D printed, etc., you must understand the different types of CAD file formats and which one you should use.  CAD files are extremely important, from design conception through production and quality inspection. 

Unfortunately, because of the variety of different CAD software available today, file compatibility has become a major issue. Because of this, you'll need to learn the difference between native and neutral CAD file formats.

Native file formats are based on the particular CAD software you're using, giving you access to the most information possible about your CAD file.  Native files give you the ability to take full advantage of all the features of a specific program (like SolidWorks), instead of skipping over aspects like what you'll see later with the neutral file format. Because of this, if your customer or vendor has the same CAD software as you, we recommend sticking with the native format.

I'm not going to go into full detail about these, but I wanted to at the very least list out the most common native CAD file formats you'll see:

Neutral file formats were developed to make it easier to exchange files with someone that is using different CAD software.  These types of file formats are extremely beneficial when you don't want to pay for another CAD software you may only use once or twice. The major drawback of choosing a neutral format is typically data quality degradation.

The most common neutral file formats we'll be going in-depth on include:

STEP is the most popular neutral CAD format in the world today as it was standardized by ISO committee in 1994 under the official name “ISO 10303-21", and was designed to be the international standard.  STEP stands for STandard for the Exchange of Product model data. 

A note on STEP editions: Not all STEP files are equal. STEP AP242 (ISO 10303-242, currently Edition 4 as of 2025) is the modern standard to request when your workflow involves PMI (Product and Manufacturing Information), GD&T, or semantic tolerancing. If you need to pass design intent, not just geometry, specify AP242 explicitly. It has also definitively replaced IGES for these use cases.

STL, which stands for Stereolithography, was designed back in the 80's when file size was a BIG deal. Similarly, it is only within the last decade that the "model is master" has been adopted by the industry. The STL file was built in a time when things like texture, small details, and EVERYTHING you ever wanted to know about a part were captured in the drawing, not the CAD file. The CAD file, up until recently, was supplementary. But now, you can store measurements, material information, texture, and loads of other information about the part.

So why do we use stuff like STLs today? Well, it's easy. The code is written. It's inexpensive to continue to use something that's been around for so long. And it still has its value today. Again, great for rapid prototyping and small file size.

2026 update: If your 3D printer or print service supports it, consider 3MF instead of STL. 3MF became an ISO standard in 2025 and carries color, texture, multi-material, and print settings that STL cannot. STL remains the safer choice when sharing with unknown equipment or older services, but for new workflows where you control both ends, 3MF is the upgrade.

3MF (3D Manufacturing Format) was developed by the 3MF Consortium — a group that includes Microsoft, Autodesk, HP, and Stratasys — specifically to replace STL for additive manufacturing. Where STL only describes surface geometry, 3MF is a smart package that carries the 3D model alongside materials, colors, textures, multi-material assignments, and even printer settings. It became ISO/IEC 25422:2025 in 2025, accelerating adoption in regulated industries such as aerospace and medical devices.

IGES, which stands for Initial Graphics Exchange Specification, was the first neutral CAD file format, developed in the late 1970s. It served the industry well for decades, but its development stopped in 1996 with IGES 5.3. In 2026, IGES persists only through historical inertia in legacy systems that cannot export STEP. For any new project, STEP AP242 supersedes IGES on every criterion: full B-Rep solid support, semantic PMI, hierarchical assembly structure, and active maintenance. If a vendor asks for IGES, ask if they can accept STEP first. IGES should be your answer only when the receiving system genuinely cannot open STEP files.

3D PDF format is considered as more of a universal choice for sharing and exchaging CAD prints as anyone with Adobe Reader can open and view it.

Parasolid is a geometric modeling kernel that can be licensed by other companies for use in their CAD software.  This format's capabilities include model creation and editing utilities, advanced surfacing, thickening & hollowing, blending & filleting, and sheet modeling.

VRML, which stands for Virtual Reality Modeling Language, is a standard format used to represent 3D interactive vector graphics.  VRML files are in plain text and are useful for transferring over the internet more quickly.  This format uses a polygonal mesh to encode surface geometry & can store appearance-related information (such as color and texture).

X3D was the successor of the VRML format.  X3D is an XML based 3D file format that supports all features of the XRML format, along with some additions. For example, on top of being able to store appearance related information (like what you can dow with VRML), X3D adds NURBS encoding of the surface geometry, the capability of storing scene related information, and support for animation.

glTF (GL Transmission Format), maintained by the Khronos Group, has become the dominant standard for 3D content on the web, in AR/VR applications, and in digital twin environments. Often called the "JPEG of 3D," it became an ISO/IEC standard in 2022. GLB is the binary-packaged, single-file version and is generally preferred for sharing. It is the format that finally replaced VRML and X3D for web and interactive 3D, and it actually succeeded where those formats stalled.

Collada is a 3D file format used more heavily within the video game and film industry.  This format supports geometry, appearance-related properties, materials, textures, and animations.  In 2013, it was adopted by ISO as a publicly available specification, ISO/PAS 17506, which resulted in lots of 3D modeling software supporting the format

DXF, whicch stands for Drawing eXchange Format, is the neutral format from AutoCAD that can cross platforms (unlike the DWG format). DXF is a vector file that stores 2D drawings, meaning that you can edit individual elements that make up an image.  DXF files are widely used as DWG since it is supported by most CAD programs.

All of this information about CAD file formats for sharing engineering design is all fine and dandy, but for those of you looking for quick answers to common questions, check out what we recommend below:

Use a Native CAD format as long as both you and your customer or vendor have the same CAD software that you're using.

At Echo, our preference goes to STEP format as it is the most popular neutral CAD format in the world. With that said, it may come down to the project you're working on. If your file contains texture or material, the STEP file may not be your best option.

STL format is an excellent choice for this option.