STEP to STL Converter
Convert Standard for the Exchange of Product Data (STEP) to Stereolithography (STL) online for free. Runs 100% in your browser. Files never leave your device. No signup, no watermarks, no limits.
Drag & drop files here, or browse
Processed on your device. Nothing is uploaded
Automate this. An open tab can convert whole folders via the Local API - still zero uploads.
Local API →How to use STEP to STL Converter
- 01Add files
Choose files or drop them here
- 02Settings
Settings · Runs on your device
- 03Download
Processed on your device. Nothing is uploaded
What is a STEP (Standard for the Exchange of Product Data) file?
STEP (ISO 10303) is the vendor-neutral standard for exchanging precise 3D product models between CAD systems like SolidWorks, Fusion 360 and CATIA.
- Developed by
- ISO
- Initial release
- 1994
What is a STL (Stereolithography) file?
STL is the standard mesh format for 3D printing. A raw list of triangles describing a solid's surface. Nearly every slicer and CAD tool accepts it.
- Developed by
- 3D Systems
- Initial release
- 1987
Frequently asked questions
How do I convert STEP to STL?
Click “Choose Files” or drag your STEP file onto the page, optionally adjust the settings, then hit Convert. Your STL file downloads straight from your browser. Nothing is uploaded anywhere.
Is this STEP to STL converter free?
Yes, completely free with no hidden limits, watermarks or signup. Because all processing happens on your own device, there are no server costs to pass on to you.
Are my files uploaded to a server?
No. The conversion engine runs entirely in your web browser using WebAssembly. Your files never leave your device. You can even disconnect from the internet after the page loads and keep converting.
Is there a file size limit?
We impose no fixed limit. The practical ceiling is your device's free memory, since processing happens locally. Most conversions work comfortably with files up to a few hundred megabytes, and image or document conversions handle much more.
Does it work on my phone?
Yes. The converter runs in any modern browser on Windows, macOS, Linux, Android and iOS. No app installation is required.