Free Online STEP 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 STEP file, once uploaded to our server will be deleted 15 minutes after upload so please download your converted STEP file before this time.

How to Convert your STEP to STL Online?

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

Upload your STEP file

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

Download your STL

Click the download link to receive your STL file.

File format information for STEP and STL

ExtensionSTEP
Full NameSTEP-File
Type3D Model
Mime Typeapplication/octet-stream
FormatBinary
Opens WithCAD Assistant

STEP files are a 3D file format used to store complex 3D object definitions in a standard format to facilitate data transfer between compatible 3D modelling and CAD (Computer Aided Design) applications. In addition to storing 3D object data, the STEP format can store additional information such as materials, tolerances, and other relevant data.

The STEP format was first released in the early 1990's, has become a standard for 3D object storage, and is used in automotive, electronics, and other industries. STEP files can be opened in most modern CAD applications and can be imported into many 3D modelling applications too.

The file content is ASCII text-based and conforms to the ISO-10303-21 standard. The 3D object contained within the STEP file is described using a combination of points, lines, and edges. Due to the format being ASCII text, complex objects can lead to large file sizes. In addition to large file sizes, some complex STEP files can take a long time to open within editing applications, even on a high-spec, modern computer.

STEP Converter Capabilities

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

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

The STL, or Standard Triangle Language, file format has been around since the '80s and is supported by most modern 3D modelling applications. In particular, the STL format has become something of a standard format within the area of 3D printing, despite the rise of more modern formats such as 3MF.

STL files come in two flavours: binary or text format. The text format is human-readable, making it easy to perform manual edits, but can lead to very large file sizes. As you can imagine, the binary format is much more compact and represents the majority of the STL files you are likely to encounter.

The format itself is very simple; the 3D model is represented by a sequential list of triangles, with each triangle defined with 3 points consisting of their X, Y, and Z positions, along with an additional vector that contains the face normal (the direction the face is pointing). There is an additional attribute block for each triangle; however, this is largely unused and thus unsupported.

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 STEP to STL

Your STEP file will be converted to a STL file using our unified 3D model and mesh conversion tool. Our STEP 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 STEP file, your final 3D model will contain geometry data only.

Frequently Asked Questions

How can I convert my STEP file to STL?

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

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

We aim to process all STEP 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 STEP 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.