Home3D Model ConverterU3D ConverterConvert U3D to STL

Free Online U3D to STL Converter

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

Please note: Your U3D file, once uploaded to our server will be deleted 15 minutes after upload so please download your converted U3D file before this time.

How to Convert your U3D to STL Online?

Here are 2 simple steps to convert your U3D to STL using our fast and free U3D converter tool.

Upload your U3D file

Click the "Upload a U3D File" button, then select a U3D to upload. The maximum file size is 100MB.

Download your STL

Click the download link to receive your STL file.

File format information for U3D and STL

Full NameUniversal 3D
Type3D Model
Mime Typemodel/u3d

A U3D file is a digital 3D model file format used to represent three-dimensional objects and scenes. The acronym "U3D" stands for Universal 3D, indicating its aim to be a versatile format compatible with various applications and platforms. U3D files store geometric information about the object's shape, such as vertices, edges, and faces, as well as texture coordinates and material properties. Additionally, U3D files can contain animation data, allowing the model to be animated and brought to life in compatible software. Due to its compact size and efficient representation, U3D is often employed for 3D graphics in interactive applications, such as real-time 3D visualization, video games, and augmented reality experiences.

U3D files are commonly used in conjunction with PDF documents, serving as embedded 3D content within a PDF file. This integration allows for interactive 3D elements in PDFs, enhancing presentations, technical documentation, and educational materials. Users can rotate, pan, and zoom into the 3D model directly within the PDF viewer, providing a more engaging and immersive experience. Moreover, U3D's compatibility with PDF ensures that the 3D content can be shared, viewed, and interacted with across different devices and platforms without the need for specialized 3D modeling software.

Developed by the 3D Industry Forum (3DIF) and later adopted as an open standard by Ecma International, U3D files continue to be supported by various 3D software applications and libraries. Its versatility, portability, and ability to enrich 3D content in PDF documents have contributed to its widespread use in diverse fields, including architecture, engineering, medicine, and entertainment. However, as with any file format, it is essential to ensure compatibility with the intended software and check for updates to maintain optimal performance and compatibility with evolving 3D technologies.

U3D Converter Capabilities

Our U3D 3D Model/Mesh tool does not support any color material data contained within U3D files so the converted file will not contain any color information.

Full NameStandard Triangle Language
Type3D Model
Mime Typeapplication/vnd.ms-pki.stl
Opens WithBlender, MeshLab, CAD Assistant, DAZ Studio

An STL file, short for Stereolithography, is a widely used file format in 3D printing and computer-aided design (CAD) applications. It serves as a standard method to represent the surface geometry of a three-dimensional object. The format was first developed by 3D Systems in 1987 and has since become a fundamental file type in the additive manufacturing industry. STL files are essential in the process of converting digital 3D models into physical objects through 3D printing technology.

STL files consist of a collection of triangular facets that approximate the shape of the 3D model. The surface of the object is divided into numerous small triangles, forming a mesh representation. Each triangle is defined by three vertices in 3D space and possesses information about its orientation and size. Since STL files store only the outer surface of the model, they are often referred to as "mesh" files or "surface" files, as they lack information about the object's internal structure or color.

When using STL files for 3D printing, slicing software processes the 3D model by dividing it into layers and creating the instructions for the 3D printer to build the object layer by layer. Despite its simplicity and widespread usage, STL files have some limitations. They do not support color or texture information, and the triangle-based representation can lead to larger file sizes and reduced accuracy compared to other file formats. Nonetheless, STL remains a vital format in the 3D printing ecosystem due to its simplicity and compatibility with a wide range of 3D printers and software.

STL Converter Capabilities

Our 3D conversion tool does not support color/material information in STL files so your file will not contain any color information.

Information for converting from U3D to STL

Your U3D file will be converted to a STL file using our unified 3D model and mesh conversion tool. Our U3D 3D tool performs accurate conversions of 3D elements such as vertices, faces, normals and relevant material information. Our tool will not attempt to transfer any color information if present in your U3D file, your final 3D model will contain geometry data only.

Frequently Asked Questions

How can I convert my U3D file to STL?

First click the "Upload..." button, select your U3D file to upload. Your U3D file will be uploaded to our servers. When the U3D to STL conversion has completed, you can download your STL file straight away.

How long does it take to convert my U3D to STL?

We aim to process all U3D to STL conversions as quickly as possible, this usually takes around 5 seconds however this can be longer for certain files, so please be patient.

How accurate is the U3D to STL conversion?

We aim to provide the best conversion experience. Our tools are under constant review and development with new features being added every week.