# 3MF to STL Converter > Convert 3MF slicer project files into STL meshes directly in the browser with local processing and no server upload. ## What This Page Is This is the main entry page for the 3MF to STL website. It combines the converter, the short workflow explanation, the key product capabilities, and a practical FAQ. ## Core Value - Local client processing - No file upload for conversion - Fast extraction of printable mesh geometry - Multi-part output support - Privacy-first workflow ## Basic Workflow 1. Upload a `.3mf` file from your device. 2. Inspect the parsed input preview, mesh statistics, and physical dimensions. 3. Confirm source and output unit, up axis, and keep, merge, or split behavior. 4. Convert locally; the exact generated STL or ZIP is reparsed with the target parser. 5. Inspect the verified output preview, then download the direct STL or multi-part ZIP. ## What the Tool Is Optimized For - compatibility-first export from 3MF to STL - users who want a simple browser workflow instead of installing another converter - users who care about privacy and do not want to upload project files - users who need clean geometry output for downstream slicers or print services ## Core Capabilities - 100% local privacy: files stay on the device - Fast conversion: optimized for quick geometry extraction - High fidelity: intended to preserve printable geometry accurately ## Format Comparison Summary 3MF and STL both represent mesh geometry, but they differ in the amount of context they store. - 3MF can store multiple objects, materials, colors, and print-related settings. - STL is geometry only. - 3MF is stronger for slicer-native project workflows. - STL is safer for broad interoperability across unknown tools and services. ## What Gets Preserved vs Lost ### Preserved - mesh triangles - baked geometry - relative part placement where it can be represented through exported output ### Lost - printer and filament targets - colors and materials - supports and modifier settings ## FAQ Highlights - Files are not uploaded to a server. - STL is useful because it is widely supported. - Multi-part 3MF files export each build item as a separate STL. - Files above 100 MB are blocked for stability. - Mobile browsing works, but large files are better handled on desktop. ## Related Pages - [STEP to STL Converter](https://3mftostl.online/step-to-stl) - [STP to STL Converter](https://3mftostl.online/stp-to-stl) - [IGES to STL Converter](https://www.3mftostl.online/iges-to-stl) - [IGS to STL Converter](https://www.3mftostl.online/igs-to-stl) - [OBJ to STL Converter](https://www.3mftostl.online/obj-to-stl) - [STL to OBJ Converter](https://www.3mftostl.online/stl-to-obj) - [GLB to STL Converter](https://www.3mftostl.online/glb-to-stl) - [3MF vs STL](https://3mftostl.online/3mf-vs-stl.md) - [How to Export 3MF to STL](https://3mftostl.online/how-to-export-3mf-to-stl.md) - [3MF to STL Online Free](https://3mftostl.online/3mf-to-stl-online-free.md) - [Privacy Policy](https://3mftostl.online/privacy.md) ## Scan and scene mesh converters - [PLY to STL](https://www.3mftostl.online/ply-to-stl): Local ASCII and binary PLY surface conversion. Triangles and convex quads only; point clouds and Gaussian splats require surface reconstruction. Scan colors and custom attributes are lost. Confirm unit and up axis. Standard PLY produces one STL, without inferred part splitting. - [FBX to STL](https://www.3mftostl.online/fbx-to-stl): Local static FBX mesh conversion with declared units, up axis and baked object transforms. Merge meshes or split them into a ZIP of STL files. Bake rigs, morph targets and animations and remove texture/media assets before upload. Scene hierarchy, materials, colors, cameras and lights are lost. Both tools show the input geometry and an output preview rebuilt by reparsing the exact download bytes. Mesh count, triangle count, finite coordinates, placement and dimensions must match before download. STL is unitless. Neither converter repairs holes, unions overlapping surfaces or reconstructs absent geometry. ## OBJ extraction from web scenes and CAD - [GLB to OBJ](https://www.3mftostl.online/glb-to-obj): Extract static GLB default-scene meshes with available normals and the first UV set. Bake node transforms, choose output unit and up axis, and keep named objects, merge, or split into a ZIP. PBR materials, texture images, vertex colors, extra UV sets and nested hierarchy are lost; no MTL file is generated. Bake rigs, morph targets and animation first. Unsupported compression, required extensions and external companion resources are rejected. - [STEP / STP to OBJ](https://www.3mftostl.online/step-to-obj): Accept both .step and .stp files on one page. Tessellate CAD solids and surfaces with Draft, Balanced or Fine quality. Coordinates are normalized to millimeters; confirm the guessed source up axis and choose output unit and orientation. Keep detected parts as flat OBJ objects, merge, or split into a ZIP. Exact CAD surfaces, B-Rep topology, colors, engineering tolerances, PMI and assembly hierarchy are lost. UVs, textures and MTL files are not reconstructed. Both workflows run locally, show parsed input geometry, and independently reparse the exact OBJ download or every OBJ entry in the generated ZIP. Download is enabled only after mesh count, triangle count, finite geometry, placement and dimensions match the conversion plan. OBJ stores no unit declaration. Import using the selected coordinate unit. Conversion does not repair meshes or perform Boolean unions. STEP output verification compares with the selected tessellation, not exact analytic CAD surfaces. - [3MF to OBJ](https://www.3mftostl.online/3mf-to-obj): Extract supported core 3MF build items as named OBJ objects, merge into one mesh or split into a ZIP. Bake component and build placement, correct mirrored faces, and convert declared units and Z-up once. Texture UVs, colors, materials, images, manufacturing metadata and slicer settings are omitted; no MTL is generated. Keep the original print project. Required extensions, invalid geometry and external dependencies are rejected. - [IGES / IGS to OBJ](https://www.3mftostl.online/iges-to-obj): Tessellate supported .iges and .igs surface or solid faces at Draft, Balanced or Fine quality. Keep, merge or split detected parts. The CAD engine normalizes units to millimeters; confirm the guessed up axis and choose output coordinates. Exact CAD topology, curves, NURBS, tolerances, drawing data and colors are lost. No surface healing, texture unwrap or MTL output is provided. Resolve external references before upload. - [PLY to OBJ](https://www.3mftostl.online/ply-to-obj): Convert ASCII or binary little/big-endian PLY 1.0 surface meshes. Retain authored normals and common vertex UV pairs (u/v, s/t, texture_u/texture_v) or face texcoord lists; triangulate planar convex quads. Scan colors, alpha, custom scanner attributes and images are omitted, with no MTL output. PLY is one mesh; merge and split are unavailable. Confirm unitless source scale and guessed up axis. Point clouds, Gaussian splats and unsupported polygons require preprocessing. These OBJ routes process files locally, show parsed input and independently reparsed output previews, and validate the exact OBJ or ZIP download against mesh count, triangles, finite geometry, dimensions and placement. OBJ stores no physical unit: import using the selected output unit. Download remains unavailable if verification fails.