3MF File Inspector
Inspect any .3mf file in your browser. View metadata, objects, vertex and triangle counts, materials, and color groups. No upload, 100% client-side.
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Free 3MF File Inspector — View 3D Print Metadata Online
The 3MF Inspector lets you open any .3mf file directly in your browser and instantly see its contents — metadata, object list, vertex and triangle counts, materials, and color groups. No software to install, no file upload to a server. Your file never leaves your device.
3MF (3D Manufacturing Format) is an open XML-based file format developed by the 3MF Consortium. It is supported by all major slicers — PrusaSlicer, Bambu Studio, Cura, Simplify3D — and 3D design tools like Fusion 360, SolidWorks, and Windows 3D Builder.
What information does the tool show?
- Metadata — title, author, description, application, creation and modification date, license terms
- Unit — millimeter, centimeter, inch, foot, or micron as declared in the model
- Objects — name, type (model, support, solidsupport), vertex count, triangle count for each mesh object
- Materials and color groups — base material display colors shown as color swatches with hex values on hover
Why use a 3MF inspector?
3MF files are ZIP archives containing XML data. You cannot simply open them in a text editor. Common use cases for inspecting a 3MF file include:
- Verifying that the correct units are set before sending to a print farm
- Checking object names and types to confirm support structures are correctly labeled
- Reviewing author and license metadata on downloaded models
- Quickly checking triangle counts to estimate model complexity and expected slice time
- Debugging material and color assignments in multi-material prints
How does it work?
A .3mf file is a ZIP archive. The tool reads the archive entirely in your browser using the File API, parses the ZIP directory structure in JavaScript, decompresses the internal .model XML file using the browser's native DecompressionStream API, and parses the resulting XML with DOMParser. No server requests are made at any point.
FAQ
Is my 3MF file uploaded anywhere?
No. The file is processed entirely in your browser. Nothing is transmitted to any server. You can use the tool offline once the page has loaded.
What 3MF features are supported?
The tool supports the core 3MF spec: model metadata, mesh objects (vertices, triangles), base materials, and color groups. The 3MF Production, Slice, and Beam Lattice extensions are not yet parsed in detail but will not cause errors.
Can I inspect files from Bambu Studio or PrusaSlicer?
Yes. 3MF files exported from Bambu Studio, PrusaSlicer, Cura, Fusion 360, and SolidWorks all follow the same core format and are fully supported.
What is the maximum file size?
There is no hard limit imposed by the tool. Parsing happens in-browser so available RAM is the only constraint. Files up to several hundred MB work fine on modern devices.