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 GLTF
Converting .stp CAD geometry to .gltf triangulates exact engineering surfaces into a mesh that printers and viewers understand. Free, private, and validated — the file never leaves your browser.
100% private for supported formats
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 glTF mesh
Converting .stp CAD geometry to .gltf 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.
A .gltf file is the JSON form of Khronos glTF 2.0: it describes nodes, meshes, accessors, and buffer references in text, often pairing with external .bin buffers or embedding them as data: URIs. It is the editable, inspectable sibling of binary .glb. For this route the practical draw is human-readable scene description and same data model as GLB, so round-trips are straightforward — balanced against external buffer URIs make a lone .gltf file incomplete, which is worth knowing before you commit a large batch.
Why convert STP to GLTF?
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 .gltf buys you human-readable scene description, which is why it is the better fit for inspecting or hand-editing mesh package structure. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
STP vs GLTF at a glance
| Aspect | STEP 3D model (.stp) | glTF mesh (.gltf) |
|---|---|---|
| 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 | uTF-8 JSON with required asset.version 2.0 and optional scenes, nodes, meshes, accessors, bufferViews, and buffers |
| Strongest at | sending exact solids to machine shops and suppliers that request the .stp spelling | inspecting or hand-editing mesh package structure |
| Weak spot | the dual naming causes confusion and duplicate entries in format lists | external buffer URIs make a lone .gltf file incomplete |
| Metadata | identical to the longer spelling: header fields for author, organization, and originating system, plus named product structure inside the data section | copyright and generator strings sit under asset; application-specific data is commonly stored in extras |
Pick GLTF as the output
Select .gltf in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if GLTF 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 GLTF file. Outputs keep the original filename with the .gltf extension.
STP to GLTF questions, answered
Will converting STP to GLTF lose quality?
Since stp is vector-oriented and gltf is vector-oriented, the conversion preserves the source content exactly as stored; no additional compression pass is applied beyond what .gltf 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 GLTF file work?
The same ecosystem that reads .glb generally reads .gltf, provided referenced buffers resolve. Browser viewers, Blender, and engine importers expect either embedded data URIs or co-located .bin files.
Will the GLTF file be bigger or smaller than my STP?
It depends on the content: uTF-8 JSON with required asset.version 2.0 and optional scenes, nodes, meshes, accessors, bufferViews, and buffers. 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.