Convert 3MF to STL in your browser
Upload a 3D model, preview it, convert formats, and download the result — all on this page.
Your files are processed locally and are not uploaded.
Built for fast and reliable model conversion
Everything you need for 3D format conversion on a single page.
Privacy-first conversion
By default, files are converted locally in your browser and are not uploaded.
Multiple input sources
Import from local files, public URLs, or directly from Google Drive Picker.
Wide format support
Input: GLB, GLTF, OBJ, STL, 3MF. Output: STL, OBJ, GLTF, GLB.
Before/after preview
Preview original and converted models side-by-side in the same workflow.
Batch conversion queue
Queue multiple files, track progress, cancel tasks, and download each result.
3MF sliced-file handling
Surface clear errors for unsupported sliced 3MF files and suggest next steps.
What users say
Real-world feedback from makers, engineers, and 3D printing teams.
We moved from manual desktop tools to this browser workflow. 3MF to STL conversion is now a 10-second job.
Ethan Park, 3D Printing Studio
Ethan Park
3D Printing Studio
The before/after preview helps me catch orientation issues before export. It saves a lot of trial and error.
Olivia Brown, Industrial Designer
Olivia Brown
Industrial Designer
Google Drive import is super convenient. I can convert shared team models without downloading them manually first.
Liam Nguyen, Hardware Engineer
Liam Nguyen
Hardware Engineer
Students can convert multiple models in batch mode and download results one by one. Great for workshop sessions.
Sofia Garcia, Education Lab Lead
Sofia Garcia
Education Lab Lead
The format support is exactly what we need: GLB/GLTF/OBJ/STL/3MF in, STL/OBJ/GLTF/GLB out.
James Wilson, Prototype Team Lead
James Wilson
Prototype Team Lead
Error messages are clear when a sliced 3MF is not supported, so I know exactly how to fix the input file.
Anna Zhang, Freelance Modeler
Anna Zhang
Freelance Modeler
Frequently Asked Questions
Have another question? Email us at support@3mftostl.cc.
Start your first 3MF conversion now
Upload from local, Drive, or URL and export to STL/OBJ/GLTF/GLB.