About JustFixSTL

JustFixSTL is a free, open-source tool for repairing 3D mesh files directly in your browser. No uploads, no signups, no server processing — everything happens locally on your device.

Built with WebAssembly technology, JustFixSTL uses the PMP (Polygon Mesh Processing) library compiled to run natively in your browser at near-native speed.

Whether you're preparing files for 3D printing, fixing models downloaded from Thingiverse, or cleaning up meshes from CAD software, JustFixSTL handles it all with one click.

Technology

The repair engine is powered by meshfix-wasm, a custom WebAssembly build of the PMP (Polygon Mesh Processing) C++ library compiled with Emscripten. It runs entirely client-side — no server required. The library is currently in testing and has not yet been published publicly. Once stability is confirmed across a range of real-world meshes, the plan is to open-source the WASM build for anyone to use.