About objtostl.com

objtostl.com exists for one job: turn a Wavefront .obj mesh into a binary STL you can open in a slicer, on the computer you already have. The people it is for are hobbyists moving a model from Blender into Bambu Studio, UltiMaker Cura, or PrusaSlicer, plus asset makers and students who need a print file without opening a second account.

The converter is a static website. Parsing and export run in your browser, in a Web Worker, using Three.js (MIT). The mesh is not posted to an application server because there is no application server for meshes. You can read that claim against the privacy page and against your browser’s Network panel.

The scope stays narrow on purpose. Units default to millimeters, and the page shows a bounding box and a triangle count so a 1000× scale mistake is visible before you heat the nozzle. Materials, MTL files, and UVs are ignored. An STL is a triangle list, and pretending otherwise wastes the download. Conversion is not manifold repair. A file that was full of holes in OBJ is still full of holes in STL.

There is no signup and no cap on binary STL downloads. ASCII export is an advanced toggle, not a paid tier. We do not convert PNG or JPG images into meshes, and we do not convert STEP or STP solids. If a CAD tool only has a solid, export a mesh OBJ there first.

Money, stated plainly: this launch does not run ads, does not ship an ad slot, and does not load an advertising script. After a successful download, the page may show optional links to official slicer downloads. Those links are not affiliate links today, and they never sit in front of the file. If advertising or affiliate links are added later, the STL download stays free and ungated. That policy is also in the terms.

The same guides are published in several languages. Each language has its own address, and the page head lists those addresses with hreflang so search engines can show the matching language. The converter works the same way in every language: the mesh stays on your device. Guides cover the Blender-to-slicer path, OBJ versus STL, millimeters versus meters, and binary versus ASCII. They are here so the tool is not a blank drop zone with no explanation of why a print came out the size of a house.

Three.js is copyright the Three.js authors and used under the MIT License. A copy of that license is linked from the footer. The rest of the site copy and the diagrams are original to this project.

Questions about a page, a bug, or the privacy policy are on the contact page. That page does not take a mesh upload, and it does not create an account.