[{"data":1,"prerenderedAt":178},["ShallowReactive",2],{"extension:v3:en:stl":3},{"resolvedFromAlias":4,"canonicalExt":5,"ext":5,"name":6,"category":7,"categoryName":8,"updatedAt":9,"popularity":10,"summary":11,"howToOs":12,"quickAnswer":18,"answerIntro":19,"whatIs":20,"description":21,"furtherReading":22,"openInstructions":41,"commonIssues":50,"securityNotes":69,"faq":73,"aliases":86,"mimeTypes":87,"relatedExtensions":89,"breadcrumbs":135,"categoryAnchor":145,"categoryFuturePath":146,"metaDescription":147,"availableHowToOs":148,"openOnDeviceLinks":149,"cannotOpenReasons":165,"cannotOpenFixes":166,"convertOptions":167,"securityAffiliateMessaging":168,"securityAffiliates":169},false,"stl","STL (Stereolithography) 3D Mesh","3d","3D","2026-06-12T08:23:21.474Z",85,"STL is a widely used 3D model exchange format for 3D printing and rapid prototyping, storing a surface as a triangle mesh. It commonly comes in either ASCII or binary form.",[13,14,15,16,17],"windows","mac","linux","ios","android","To open .STL files on Windows, install Blender (or use an existing 3D tool that supports STL).","To open a .stl file, use a 3D viewer or modeling tool that supports STL import—Blender can open STL on Windows, macOS, and Linux. STL files are typically used for 3D printing workflows and quick sharing of mesh geometry.","STL (Stereolithography) represents a 3D object’s surface geometry as a triangulated mesh (facets), not as parametric CAD features. The format exists in two encodings—ASCII and binary—and primarily describes the outer surface rather than color, materials, or rich scene data.","STL is a de facto standard file format in rapid prototyping and 3D printing, commonly exported from CAD systems for fabrication-oriented workflows. Because it is simple and widely supported, it is often used as a “handoff” format between design software and 3D printing tools.\n\nTechnically, STL stores a triangulated surface mesh: a collection of triangles that approximate the object’s surface. This makes it easy to process for slicing and manufacturing, but it also means STL does not preserve many design-intent details (for example, parametric features) that might exist in the original CAD model.\n\nSTL can be stored as ASCII text or as a more compact binary representation. In Internet/media-type contexts, IANA registers STL as model/stl (with prior use of application/sla also noted in references).",[23,26,29,32,35,38],{"title":24,"url":25},"Media Types - IANA (model/stl registration)","https://www.iana.org/assignments/media-types",{"title":27,"url":28},"STL (STereoLithography) File Format, Binary - Library of Congress","https://www.loc.gov/preservation/digital/formats/fdd/fdd000505.shtml",{"title":30,"url":31},"STL (file format) - Wikipedia","https://en.wikipedia.org/wiki/STL_%28file_format%29",{"title":33,"url":34},"What Is An STL File? | 3D Systems","https://www.3dsystems.com/quickparts/learning-center/what-is-stl-file",{"title":36,"url":37},"STL - Blender 4.5 LTS Manual (Import/Export)","https://docs.blender.org/manual/en/latest/files/import_export/stl.html",{"title":39,"url":40},"STL - Wikidata","https://www.wikidata.org/wiki/Q1238229",{"windows":42,"macos":45,"linux":46,"ios":47,"android":49},[43,44],"Install Blender (or use an existing 3D tool that supports STL).","In Blender: File → Import → Stl (.stl), then select your file.",[43,44],[43,44],[48],"If you can’t open the .stl with an app on your device, transfer it to a desktop system and open it in Blender via File → Import → Stl (.stl).",[48],[51,57,63],{"title":52,"description":53,"steps":54},"Model imports but looks faceted, blocky, or low-detail","STL represents geometry as a triangle mesh; if the exporting program used a coarse tessellation, curved surfaces may appear faceted.",[55,56],"Re-export the STL from the source CAD tool using a finer mesh/tessellation setting (higher resolution).","If available in your tool, inspect the mesh density after import and compare to the expected surface quality.",{"title":58,"description":59,"steps":60},"STL opens with the wrong program (double-click issue)","Your operating system may associate .stl with a different app than the one you want to use.",[61,62],"Open Blender first, then use File → Import → Stl (.stl) to load the file.","Change the default app for .stl files in your OS if you regularly open STL files with the same tool.",{"title":64,"description":65,"steps":66},"Import fails or the model looks corrupted","STL exists in both ASCII and binary forms; some tools handle one form better than the other, and malformed files can cause import errors.",[67,68],"Try re-exporting the file from the source tool as the other STL encoding (ASCII vs binary).","If you have access to the original model, generate a fresh STL export instead of using a re-saved copy.",[70,71,72],"STL is primarily geometry data (a mesh), not a scriptable document format, but opening untrusted STL files can still be risky if a viewer/importer has parsing vulnerabilities—prefer trusted, up-to-date 3D software.","STL files can be very large (especially high-resolution meshes); opening an unexpectedly huge STL can cause memory or performance issues in 3D tools.","MIME type handling can vary; model/stl is registered with IANA, while older usage such as application/sla may still appear in the wild—be cautious when relying on file-type detection during downloads or automated pipelines.",[74,77,80,83],{"question":75,"answer":76},"What is an STL file used for?","STL is widely used for rapid prototyping and 3D printing workflows as a simple way to exchange 3D surface geometry between CAD/modeling tools and manufacturing/slicing tools.",{"question":78,"answer":79},"Does STL store colors, materials, or textures?","STL is primarily a triangulated surface mesh format; it is not designed as a rich scene format with materials and textures.",{"question":81,"answer":82},"Is there more than one kind of STL file?","Yes. STL commonly exists in ASCII and binary encodings; they represent the same type of triangle-mesh data but differ in storage and readability.",{"question":84,"answer":85},"What is the official MIME type for STL?","IANA registers STL as model/stl.",[],[88],"model/stl",[90,96,101,107,113,119,124,129],{"ext":91,"name":92,"category":7,"categoryName":8,"popularity":93,"summary":94,"howToOs":95},"fbx","Autodesk FBX (Filmbox) 3D interchange format",78,".fbx is a proprietary 3D scene and asset exchange format owned by Autodesk and widely used to move models, animation, and scene data between 3D tools and game/animation pipelines.",[13,14,15,16,17],{"ext":97,"name":98,"category":7,"categoryName":8,"popularity":93,"summary":99,"howToOs":100},"obj","Wavefront OBJ (3D geometry) file","OBJ is a widely used text-based 3D geometry format that stores vertices, texture coordinates, normals, and polygon faces. It is commonly accompanied by a separate MTL material library file for appearance settings.",[13,14,15,16,17],{"ext":102,"name":103,"category":7,"categoryName":8,"popularity":104,"summary":105,"howToOs":106},"gltf","glTF (GL Transmission Format) 3D Asset",70,".gltf is a JSON-based 3D scene/model format (glTF 2.0) used to exchange and render 3D assets. It’s commonly opened in 3D tools like Blender, web apps via Three.js, and viewers that support glTF.",[13,14,15,16,17],{"ext":108,"name":109,"category":7,"categoryName":8,"popularity":110,"summary":111,"howToOs":112},"glb","glTF Binary (GLB)",68,".glb is the binary form of glTF 2.0, commonly used to deliver 3D models and scenes as a single file. It’s widely supported by 3D tools and viewers that can import/export glTF.",[13,14,15,16,17],{"ext":114,"name":115,"category":7,"categoryName":8,"popularity":116,"summary":117,"howToOs":118},"3mf","3D Manufacturing Format (3MF)",55,".3mf is the 3D Manufacturing Format (3MF), an open standard for exchanging 3D print-ready models and related data. It is commonly opened in 3D printing “slicer” software such as PrusaSlicer.",[13,14,15,16,17],{"ext":120,"name":121,"category":7,"categoryName":8,"popularity":116,"summary":122,"howToOs":123},"blend","Blender Project File (BLEND)",".blend is Blender’s native project file that can store an entire 3D scene (objects, materials, textures references, animations, etc.) in one file. It is primarily opened and edited with Blender.",[13,14,15,16,17],{"ext":125,"name":126,"category":7,"categoryName":8,"popularity":116,"summary":127,"howToOs":128},"ply","Polygon File Format (PLY / Stanford Triangle Format)",".ply is a 3D geometry file format commonly used for polygon meshes and point clouds. It can store vertex/face data plus per-element properties, in either ASCII or binary encodings.",[13,14,15,16,17],{"ext":130,"name":131,"category":7,"categoryName":8,"popularity":132,"summary":133,"howToOs":134},"mtl","Wavefront Material Template Library (MTL)",45,".mtl is a text-based material library used with Wavefront OBJ (.obj) files to describe surface appearance such as colors, shininess, transparency, and texture maps.",[13,14,15,16,17],[136,139,142],{"label":137,"to":138},"Home","/",{"label":140,"to":141},"File Extension Index","/file-extension",{"label":143,"to":144},".STL","/file-extension/stl","category-3d","/category/3d","Learn what .STL files are, how to open them on every platform, common fixes, and security best practices.",[13,14,15,16,17],[150,153,156,159,162],{"os":13,"label":151,"to":152},"Open .STL on Windows","/how-to/open-stl-on-windows",{"os":14,"label":154,"to":155},"Open .STL on Mac","/how-to/open-stl-on-mac",{"os":15,"label":157,"to":158},"Open .STL on Linux","/how-to/open-stl-on-linux",{"os":16,"label":160,"to":161},"Open .STL on iOS","/how-to/open-stl-on-ios",{"os":17,"label":163,"to":164},"Open .STL on Android","/how-to/open-stl-on-android",[52,58,64],[55,56],[],"untrusted_source",[170,174],{"name":171,"description":172,"affiliateUrl":173},"Avast","Avast offers free and premium antivirus software that protects against viruses, malware, ransomware, and phishing. Scan files before opening them to ensure safety.","https://www.avast.com/lp-aff-consumer-store?expid=inf601",{"name":175,"description":176,"affiliateUrl":177},"Norton","Norton 360 delivers comprehensive antivirus protection, VPN, and identity theft monitoring. Scan files for threats before opening to keep your device secure.","http://buy.norton.com/aff_home?utm_campaign=en-ww_nor_n36_aff_nas_nau_nah_cj_nad_low:_sec_nat_mktc_norton_360",1781269501179]