Converting a 3D File Between Formats

Convert it, check it actually looks right, then fix the encoding if you need to.

Conversion comes first since it's the actual task -- getting the file into the format a specific piece of software or a 3D printer requires. Viewing the result afterward matters because format conversion between mesh types can occasionally introduce visible issues (flipped normals, lost detail) that aren't obvious from the file size or metadata alone, only from actually looking at it. Fixing STL encoding is presented as a conditional last step because ASCII versus binary STL is a narrower, more specific problem that only some target software actually cares about.

Each step opens as its own tool -- download from one, upload into the next, same as any free tool on the site.