How batch conversion works
- Drop several files (or select them with Shift/Ctrl).
- Choose the output format.
- Click Convert & download ZIP. Each file is converted on your device and packed into one ZIP.
Mixed formats are fine
You can mix STL, OBJ, STEP, 3MF, GLB, FBX and PLY files in one batch. With "Fix units & up-axis" ticked, metre-based models (GLB, glTF) are scaled to millimetres for printing formats, and Y-up models are turned upright for slicers.
Frequently asked questions
How many files can I convert at once?
Free users can convert up to 3 files per day. Pro has no limit – batches of hundreds of files work, limited only by your device's memory.
Are the files uploaded?
No. Everything happens in your browser.