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Export and import design files

Export​

Choose File > Export.... The dialog offers the whole project or the document that is open:

The export dialog: the whole project, with or without geometry, or the open document as a design document, STEP, GLB, BREP or STL
ChoiceWhat you get
ProjectEvery document of the project in one .bitbybit file, to keep, share or open again.
Project with geometryThe same with its built geometry (.bitbybitz), so it opens almost at once.
Design documentThe open document as a design document (.design.json).
STEPThe open document as CAD for other programs, with its assembly tree, names and colours.
GLBA 3D model for the web and for viewers.
BREPOpenCascade's own exact format.
STLA mesh for 3D printing.

When you view someone else's design below Gold, the dialog offers only what its author allows under Visitors can download, and greys out the rest with the reason.

Import​

  • File > Import design documents adds the documents of a .bitbybit, .bitbybitz or design document file to the project. A document with the same id as one you have replaces it.
  • File > Import STEP, IGES or BREP keeps a file from another CAD program with the project and starts a part that imports it. It needs the project to be open on bitbybit.dev, which keeps the file.

Verified against the product in October 2026