Add your STP file
Drop one or more .stp files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
STP to 3MF
Converting .stp CAD geometry to .3mf triangulates exact engineering surfaces into a mesh that printers and viewers understand. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop STP files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting STEP 3D model to 3D Manufacturing Format
Converting .stp CAD geometry to .3mf triangulates exact engineering surfaces into a mesh that printers and viewers understand. Files named .stp are STEP models wearing the three-letter extension that DOS-era 8.3 filename limits made necessary; there is no format difference between .stp and .step. Inside is an ISO 10303 product model — precise solid geometry written as plain text for exchange between CAD systems.
3MF, the 3D Manufacturing Format with extension .3mf, is the modern replacement for STL in 3D printing. One .3mf file carries a complete print job — watertight meshes with declared units, colors, materials, multiple objects, and even slicer settings — inside a compact ZIP-based package. For this route the practical draw is fixes STL's canonical gaps — units, color, materials, manifold guarantees — in one open, royalty-free specification and zIP compression makes files far smaller than equivalent STL — balanced against ecosystem support outside 3D printing is still thinner than OBJ or STL, which is worth knowing before you commit a large batch.
Why convert STP to 3MF?
The practical trigger for this conversion is usually a mismatch: with .stp, the dual naming causes confusion and duplicate entries in format lists. Switching to .3mf buys you fixes STL's canonical gaps — units, color, materials, manifold guarantees — in one open, royalty-free specification, which is why it is the better fit for saving complete print projects with slicer settings preserved. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
STP vs 3MF at a glance
| Aspect | STEP 3D model (.stp) | 3D Manufacturing Format (.3mf) |
|---|---|---|
| Format type | Vector — resolution-independent geometry instead of pixels | Vector — resolution-independent geometry instead of pixels |
| How it stores data | byte-for-byte the same syntax as .step, so renaming between the two extensions changes nothing about how any parser treats the file | an OPC package — the same ZIP-with-XML convention as .docx — whose 3D payload is an XML model part |
| Strongest at | sending exact solids to machine shops and suppliers that request the .stp spelling | saving complete print projects with slicer settings preserved |
| Weak spot | the dual naming causes confusion and duplicate entries in format lists | ecosystem support outside 3D printing is still thinner than OBJ or STL |
| Metadata | identical to the longer spelling: header fields for author, organization, and originating system, plus named product structure inside the data section | the core specification defines metadata elements for title, designer, description, license, and creation date, and vendor extensions attach slicer and production settings |
Pick 3MF as the output
Select .3mf in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if 3MF is selectable, the route is real and validated.
Convert on your device
Press Convert. Open CASCADE compiled to WebAssembly triangulates the exact CAD geometry into a mesh inside your browser.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid 3MF file. Outputs keep the original filename with the .3mf extension.
STP to 3MF questions, answered
Will converting STP to 3MF lose quality?
Since stp is vector-oriented and 3mf is vector-oriented, the conversion preserves the source content exactly as stored; no additional compression pass is applied beyond what .3mf itself requires.
Is it private to convert STP files here?
Yes — the .stp file is processed inside your browser tab and never uploaded. Open CASCADE compiled to WebAssembly triangulates the exact CAD geometry into a mesh inside your browser. Close the tab and the file is gone from memory.
Where will the 3MF file work?
Windows has treated .3mf as a first-class format since Windows 10, with built-in preview support, and every major slicer now reads and writes it — several use it as their default project format. CAD support is solid in Fusion 360, SolidWorks, and FreeCAD, while general 3D graphics tools like Blender need an importer add-on.
Will the 3MF file be bigger or smaller than my STP?
It depends on the content: an OPC package — the same ZIP-with-XML convention as .docx — whose 3D payload is an XML model part. Convert one representative file first and compare before batch-processing a large set.
What happens to the metadata in my STP file?
In .stp, identical to the longer spelling: header fields for author, organization, and originating system, plus named product structure inside the data section. Re-encoding through the browser pipeline does not carry embedded metadata into the output, which doubles as a privacy scrub — check the exported file if you specifically need tags preserved.