Support

Most problems are one of five things: an unsupported format, a file larger than the tab can hold, a missing unit, a mesh that was never watertight, or a browser blocking the download. The short answers are below.

Browser converter

The file will not open

Check the extension against the supported format list. The browser build reads 28 input formats; DWG, DXF and SAT are not among them. DXF is available in the Windows app only. If the extension is supported, the file may be damaged, password-protected or use a variant the loader does not accept — try opening it in a desktop viewer first.

A large model fails or the tab runs out of memory

Everything runs inside the tab, so the limit is your machine's memory, not an upload quota. Close other tabs, try a smaller detail preset, or split the assembly. If the file is regularly above 100 MB, the Windows app is the better tool because it runs the kernel natively instead of inside a browser sandbox.

IFC does not load

IFC is the one format that needs a network request: the web-ifc library is fetched from jsDelivr the first time you convert an IFC file. If a firewall, an ad blocker or an offline connection blocks jsDelivr, IFC conversion will fail while every other format still works. Allow cdn.jsdelivr.net for this site, or use the Windows app, which ships the library locally.

The download does not start

Some browsers block automatic downloads until you allow them for the site. Check the address bar for a blocked-download icon. On iOS, large Blob downloads can also fail; use a desktop browser for models above roughly 50 MB.

Output problems

The part is the wrong size

STL and most mesh formats carry no unit. A STEP file authored in inches comes out 25.4 times too small when a slicer assumes millimetres, and a metre-authored IFC comes out a thousand times too large. Measure the bounding box in your slicer and scale on import. The converter does not guess a unit.

Colours, materials or part names are missing

This depends on the output format. Binary STL has no colour or material field, and OBJ needs a separate MTL file that the browser build does not write. glTF, GLB, 3MF and USDZ can carry materials, but only if the source file contained them and the loader preserved them. Part names and assembly hierarchy are flattened in every mesh output.

The mesh is not watertight

Tessellation is done face by face, so adjacent surfaces can end at slightly different coordinates. A finer preset reduces the gaps but does not certify a closed shell. Run the result through your slicer's repair step, or use a mesh editor to weld vertices before printing.

Windows app

System requirements

Windows 10 version 1809 or later, or Windows 11, on a 64-bit (x64) machine. The WebView2 runtime ships inside the installer, so there is no separate download. The interface is available in eight languages.

Trial and Pro

The trial is the Microsoft Store's feature-limited build. It converts files up to 100 MB, one at a time, and writes all 12 mesh formats. Pro unlocks three things: STEP, IGES and BREP export, batch queues of up to 50 files, and files above 100 MB. The kernel and the preview are identical in both.

Where does the output go?

Next to the source file, with the same base name and the new extension. When the output format matches the input format, the result gets a -converted suffix, so the original is never overwritten. Batch results go to the folder you choose in the queue.

A batch item failed

One bad file does not stop the queue: the item is reported and the rest continue. Check whether the failed file opens in the single-file view, and whether its format is in the supported list. A folder drop is scanned recursively, up to 200 files, and symlinks are skipped.

Still stuck

Send a report through the contact page. Include the page URL or the app version, the source and target format, the file size and a screenshot of the error. Do not attach a confidential CAD file; describe the geometry instead, or send the smallest sample that reproduces the problem.