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JT viewer

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About JT

Siemens JT — engineering 3D interchange.

JT is Siemens's engineering interchange format — the lingua franca of aerospace and automotive PLM toolchains. We parse the file header and surface its structure and embedded text — JS renderers for this format don't exist yet. occt-import-js wraps OpenCASCADE, which has a JT reader in C++, but the WASM port doesn't expose it. So we parse the 80-byte ASCII header (version magic, byte-order flag), then dump the leading bytes and pull printable strings out of the segment stream so you can verify producer, version, and embedded part names before converting the file.

FAQ
What is a JT file?
JT is an ISO-standardised 3D interchange format created by Siemens for engineering PLM. It packs tessellated facets, optional B-rep, PMI annotations, and assembly structure into a compact binary stream.
What does this viewer actually render?
We parse the 80-byte JT header — version magic, byte-order flag — and dump the leading bytes plus embedded printable strings. We do not render the 3D geometry: occt-import-js ships only STEP, IGES, and BREP readers in WebAssembly.
How do I view the geometry?
Convert the JT to STEP or glTF in a desktop tool (Siemens JT2Go, JT Open Toolkit, CAD Exchanger), then open the STEP or glTF file here.
Is my file uploaded?
No. Files are opened entirely in your browser. Nothing is sent to a server.
Does it work on mobile?
Yes. The viewer is mobile-first and works on phones, tablets, and desktops.
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