Free · Private · Secure
3D Model Converter
Inspect your model. Change its format.
See what carries through before you download.
Free local conversions. No sign-up.
Explore the 3D vieweror drop files here
Local models up to 100 MB
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Try an example.
Choose your source format
Browse the formats supported by this 3D model converter.
A 3D converter should show what changes
See what your model keeps, what changes, and what the output can carry.
Why the format matters
Converting a 3D file is not just a matter of changing its extension. STL stores a triangle surface but has no standard materials, textures, hierarchy, animation, or physical unit. OBJ can reference MTL and image files. GLB and glTF can carry a scene with materials, textures, nodes, and animation. Moving between those formats changes what the output can represent.
This 3D model converter puts those limits next to the tool. You can see what a route preserves, choose the settings that apply to that route, and read a before-and-after report before downloading the result. If a format cannot carry a feature, the page says so.
Private local processing
Selected mesh files are processed on your device.
How it works: Private local processing
STL, OBJ, PLY, GLB, and glTF routes parse selected files inside a browser worker. If a model references an external dependency that you did not select, the converter rejects it instead of fetching it from the internet.
Before-and-after validation
The exported file is reopened and checked.
How it works: Before-and-after validation
After export, the tool opens the output again. A file that cannot be parsed or contains no renderable triangles is rejected. The report compares dimensions, triangles, objects, materials, textures, units, and axis data when available.
Dependency-aware packages
Keep the model and its referenced files together.
How it works: Dependency-aware packages
Choose an OBJ with its MTL and texture images, or a glTF with its BIN and image files. Keeping the referenced names together gives the local loader the same package your modeling application expects.
Honest format loss
Review the properties each route can preserve.
How it works: Honest format loss
Materials, textures, hierarchy, animation, units, and coordinate axes do not survive every route. The route warning describes the expected loss, while the quality report records what was found in the source and output.
How to use the 3D model converter online
Four practical steps
Choose a file, select an output format, and inspect the converted model.
About local processing
The 3D model converter keeps the workflow to four steps. Choose a source file, add any files it references, select an output format, and run the conversion. Common mesh and scene formats use the local browser path, so you can complete the job without creating an account or sending the model to our server.
- Step 1
Add the source model
Choose your model to see available output formats.
Details: Add the source model
Choose a local model with the file picker above. The homepage identifies its format and opens the available destinations. Your selection stays in memory as you continue to a converter, where you can inspect the model before starting.
- Step 2
Select the complete package
Include the MTL, BIN, and images your model references.
Details: Select the complete package
A single STL, PLY, or GLB is often enough. OBJ and glTF may rely on separate files. Select the related MTL, BIN, and image files together with the model, keeping their original names so local references can be resolved without a network request.
- Step 3
Choose the target and settings
Pick an output format and review its settings and limitations.
Details: Choose the target and settings
Pick one of the available output formats, then review the route warning. Options appear only when the local engine implements them. Unit, axis, normal, hierarchy, texture, and packaging choices depend on the source and target pair.
- Step 4
Review before downloading
Compare the result, inspect warnings, then download.
Details: Review before downloading
The output is loaded again before it is offered for download. Compare the source and result, read any loss or geometry warnings, preview the converted model, and download only after the file matches the job you intended to run.
Choose the right format before you convert
Format choice matters
Match the output format to the data your next tool needs.
How to choose an output
The best output is the one that keeps the data your next tool needs. A slicer usually wants a simple surface. A web viewer may need PBR materials, textures, hierarchy, and animation. An editing workflow may prefer readable geometry and separate resources. Use this comparison as a starting point, then check the route-specific warning in the converter.
STL
- What it carries
- Triangle geometry and facet normals
- Good fit
- 3D printing and geometry-only handoff
- Check before use
- No standard unit, material, texture, or scene data
OBJ
- What it carries
- Mesh geometry, UVs, normals, groups, and MTL references
- Good fit
- Editable mesh exchange and older 3D pipelines
- Check before use
- Materials and images often live in separate files
PLY
- What it carries
- Polygon or point data with optional vertex properties
- Good fit
- 3D scans, photogrammetry, and geometry processing
- Check before use
- Custom properties and vertex colors may not reach the target
GLB
- What it carries
- A packaged glTF scene with binary resources
- Good fit
- Single-file web delivery and portable previews
- Check before use
- Large textures and geometry still affect download size
glTF
- What it carries
- Readable scene JSON with BIN and image references
- Good fit
- Web 3D debugging and separate-resource workflows
- Check before use
- Every referenced dependency must travel with the JSON
Popular 3D converter routes for mesh and web files
Popular local routes
Common conversions for printing, editing, and web delivery.
What these routes include
These 3D model converter routes run on your device and cover common handoffs between printing meshes, editable geometry, scan data, and web-ready scenes. Each route page includes the working converter, format-specific warnings, settings that the engine actually supports, and a report comparing the input with the result.
GLBOBJ
Export scene geometry for mesh editing.
Open 3D converterGLBSTL
Extract a geometry-only printing mesh.
Open 3D converterSTLOBJ
Move a triangle mesh into an OBJ workflow.
Open 3D converterOBJSTL
Create a geometry-only mesh from OBJ.
Open 3D converterglTFOBJ
Extract static meshes from a glTF scene.
Open 3D converterglTFGLB
Package glTF and its resources into one file.
Open 3D converterOpen the model in a private 3D viewer
Inspect before converting
Rotate the model, switch projection, inspect wireframes, and review dimensions and mesh statistics before choosing an output format. The 3D model converter and viewer use the same local dependency rules, so an OBJ can open with its MTL and images and a glTF can open with its BIN and texture files. It is a quick way to catch the wrong file, missing resources, or an unexpected scale before you export anything.
Open the free 3D viewer3D conversion questions
Do local conversions upload my 3D file?+
No. This 3D model converter parses selected STL, OBJ, PLY, GLB, and glTF files in your browser for local routes. Unselected external dependencies are rejected instead of fetched. STEP and IGES use a separate cloud conversion path only after a verified user starts the upload.
Is this 3D converter free to use?+
Yes. The browser-local conversion routes and 3D viewer are available without creating an account. The main local model file is limited to 100 MB; large dependency packages can still run into browser memory limits. Cloud CAD processing, saved history, and account storage are separate from the free local workflow.
Which 3D format should I use for the web?+
GLB is often the simplest delivery choice because it can package geometry, PBR materials, textures, hierarchy, and animation in one file. Choose glTF instead when readable JSON and separate resources make debugging easier. Engine and extension support still needs to be checked in the application that will load the asset.
Why does OBJ or glTF ask for additional files?+
Those formats can reference resources outside the main file. An OBJ may point to an MTL file and texture images. A glTF may point to BIN buffers and images. Select the complete package with the original file names; otherwise the geometry may load without its materials or the model may fail because a required buffer is missing.
Why does a converted model have the wrong scale?+
STL and OBJ workflows often rely on external unit conventions, while glTF defines meters. A value of 1 can therefore mean one millimeter in a slicer and one meter in a web scene. Compare the bounding-box dimensions, check the source application export settings, and choose an explicit unit instead of trusting the extension alone.
Can converting a file repair non-manifold geometry?+
No. The quality report can flag degenerate triangles and non-manifold edges, but changing the file container does not fill holes, remove self-intersections, or create printable wall thickness. Repair the source in a mesh or CAD tool, then convert the corrected model and check the report again.
