🎉Ultra is live · 50% off — limited time
LogoModelfy 3D
Local converter

OBJ to 3MF Converter

Convert OBJ files to 3MF locally in your browser for faster handoff across 3D tools.

Processed locally
No signup required
Files stay on your device
Browser-local OBJ to 3MF conversion illustration

Private browser conversion

Files are converted locally in your browser.

1Upload2Convert3Download

Browser-local workflow

How this tool works

  1. Step 1

    OBJ

    Choose a OBJ file from this device.

  2. Step 2

    Browser-local conversion

    The supported geometry is converted in this browser.

  3. Step 3

    3MF

    Download the 3MF result when conversion is complete.

Preserved

  • Geometry

Lost

  • Materials
  • Textures
  • Scene hierarchy

Direct answer

What is preserved when converting OBJ to 3MF?

This converter processes the OBJ file locally in your browser and downloads the converted 3MF file. Geometry is retained by the current loader and writer. Materials, textures, and scene hierarchy are not included in the downloaded file.

Before you convert

OBJ to 3MF compatibility

These results describe Modelfy's current browser loader and exporter, not every feature allowed by the file specifications.

Data preserved, limited, or lost when converting OBJ to 3MF
DataResultWhat this implementation does
GeometryPreservedThe custom writer creates one triangle-mesh object from world-space geometry.
MaterialsNot exportedThe uploader accepts one OBJ file, so a companion .mtl file is not read.
TexturesNot exportedThe uploader accepts one OBJ file, so images referenced by a companion .mtl file are not read.
Vertex colorsNot in sourceOBJ does not define vertex colors to carry into 3MF.
AnimationNot in sourceOBJ does not define animation to carry into 3MF.
Scene hierarchyNot exported3MF output from this tool does not store scene hierarchy.
Units and scaleNot in sourceOBJ does not define units and scale to carry into 3MF.

Verify after export

  • Confirm scale and units when opening the 3MF file in the destination application.
  • Compare material colors and textures with the browser preview before using the result in production.

Why choose this OBJ to 3MF converter

Local OBJ decoding

The selected OBJ model file is decoded and rewritten as 3MF on your device; the model file is not uploaded to Modelfy.

OBJ to 3MF data report

The compatibility table identifies geometry as preserved by this loader and writer.

3MF output checks

Materials is lost; review the implementation detail and verify the downloaded file in your destination tool.

Preview before export

Inspect the browser preview before converting, then use the post-export checklist to confirm the 3MF result.

How to convert OBJ to 3MF online

  1. 01

    Upload your OBJ file

    Drag and drop the file into the converter, or click Upload. OBJ inputs up to 10 MB are processed locally.

  2. 02

    Convert to 3MF

    Preview the model in 3D, then click Convert. The conversion runs locally in the browser; processing time depends on model complexity and device resources.

  3. 03

    Download the 3MF file

    Your 3MF file downloads straight to your device, ready for the next tool in your pipeline.

About the OBJ file format

Wavefront OBJ

The Wavefront OBJ format has been a de facto interchange standard since the 1990s. It stores vertex positions, normals, texture coordinates, and faces in plain text, with materials described in a companion .mtl file.

OBJ does not support animation or scene hierarchies, which keeps it simple and portable across many modeling, printing, and rendering tools.

Format reference: Library of Congress OBJ format description

Strengths

  • Broad support across established 3D tools
  • Simple structure that is easy to debug
  • Reliable geometry interchange

Commonly used for

  • Static model exchange between tools
  • 3D printing preparation
  • Photogrammetry and scan output

About the 3MF file format

3D Manufacturing Format

3MF was created by the 3MF Consortium (Microsoft, HP, Prusa, Ultimaker, and others) as the successor to STL for additive manufacturing. It is a ZIP-based container holding an XML mesh description with real units, colors, materials, and printer metadata.

Modern slicers like PrusaSlicer, Bambu Studio, and Cura prefer 3MF because a single file can carry the full print project.

Format reference: 3MF Consortium core specification

Strengths

  • Real units and manifold guarantees
  • Color and material support
  • Native format of modern slicers

Commonly used for

  • 3D print project exchange
  • Color/multi-material printing
  • Slicer-ready model delivery

Frequently asked questions

Is my OBJ model file uploaded to a server?

The selected OBJ model file is processed by the browser and is not uploaded to Modelfy. Website code and static assets still load over the network like a normal web page.

Will I lose quality converting OBJ to 3MF?

Mesh geometry is preserved as closely as the 3MF format allows. The target format may triangulate geometry or drop unsupported features such as animations, materials, textures, or scene hierarchy.

Is the OBJ to 3MF converter free to use?

Yes. The browser viewer, converter, and local 3D text tool require no account and add no watermark. Input limits vary by format, up to 50 MB; AI model generation is a separate credit-based product.

What is the maximum file size?

OBJ inputs up to 10 MB are accepted. The format-specific limit keeps browser-local parsing bounded; actual processing also depends on available memory, model complexity, and device performance.

Where are the materials and textures of my OBJ file?

OBJ stores materials in a separate .mtl file with texture images alongside it. This single-file browser tool does not request those companions, so it displays supported OBJ geometry with a neutral material; review the compatibility table before conversion.

Is 3MF better than STL for printing?

3MF stores explicit units, avoids the leaky triangle-soup pitfalls of STL, and can embed colors and print settings, so most modern slicers recommend it. Converted files from this tool use millimeter units.

Related converters

Convert OBJ to more formats

Convert other files to 3MF

AI 3D generation

From a single image to a production-ready 3D model

These browser tools stay free for viewing and converting files you already have. When the model does not exist yet, Modelfy generates a textured mesh from one reference image — the first one is free.

Try the AI 3D generator