Convert SAT to X3D (Free)
Also converts STL, OBJ, GLB, PLY, USDZ, 3MF from the same file.
Runs in your browser. No upload, no signup, nothing to install.
Also from Innerscene: Circadian Lab, a free lighting calculator for room illuminance, melanopic EML, and glare.
How to convert SAT to X3D
- 1
Open your .sat file
Drag it onto the viewer above, or click "Open an SAT File". Files up to 200 MB open directly; the parse runs in a worker so the page stays responsive.
- 2
Pick X3D (XML encoding) in the Export menu
Click Export in the toolbar, then X3D (.x3d).
- 3
Download
The .x3d is written in the browser and saved straight to your downloads folder. No queue, no email, no watermark.
What survives the conversion
A file conversion is a translation, and formats do not carry the same things. Here is exactly what moves from SAT into X3D, and what does not.
| Geometry | Reduced | SAT stores exact B-rep solids and X3D stores triangles, so the surfaces are tessellated. Curved faces become faceted at the display tolerance, which is fine for visualization, printing and clash checking, but not for further parametric CAD work. |
|---|---|---|
| Colors and materials | Reduced | SAT can hold material colors and X3D holds per-vertex color, so materials are flattened to that. |
| Layers and structure | Dropped | X3D is a single flat body with no layers or named parts. Everything merges into one object. If you need the structure, export to GLB, OBJ, DXF instead. |
| Units and scale | Kept | X3D stores an explicit unit, so the model opens at true size without rescaling. |
What the X3D writer emits: X3D 3.3, XML encoding, with one Shape per mesh: IndexedFaceSet for triangles, IndexedLineSet for lines and PointSet for clouds, with Material and per-vertex Color nodes. Converted to meters, Y-up.
The source: ACIS (SAT / SAB) (.sat, .sab, .asat, .asab)
The exact B-rep ACIS saves: solid and sheet bodies with their plane, cylinder, cone, sphere, torus and NURBS faces trimmed by their edges, from the text (.sat) and binary (.sab) encodings and Autodesk’s ASM dialect alike, tessellated with each body’s colour in the units the file declares.
The target: X3D (XML encoding) (.x3d)
The XML successor to VRML, still read by CAD and visualization tools that standardized on it.
Opens in: InstantReality, View3dscene, BS Contact, MeshLab.
Your file never leaves your computer
Both the SAT parser and the X3D writer are JavaScript and WebAssembly running in your own browser tab. There is no upload step, no server-side conversion queue, and no copy of your file anywhere but your machine. That matters for drawings under NDA, for client work, and for anything you would not email to a stranger.
Free to Use, No Signup
There are no accounts and no watermarks on this converter. If it saved you time, the one thing we ask is a mention: a post, a link from your blog or course page, or a reply to someone asking how to open a file.
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Hear about new formats
Occasional emails when the viewer learns a new format or gets a new tool.
Frequently asked questions
▶Is this SAT to X3D converter free?
Yes. No signup, no watermark, no per-file limit and no paid tier. Innerscene.
▶Is my SAT file uploaded anywhere?
No. The file is read with the browser file API and converted in the same tab. Nothing is sent to a server unless you explicitly click Share, which is a separate, opt-in feature.
▶Will my colors and materials survive the X3D export?
SAT can hold material colors and X3D holds per-vertex color, so materials are flattened to that.
▶Do layers and named parts carry into the X3D file?
X3D is a single flat body with no layers or named parts. Everything merges into one object. If you need the structure, export to GLB, OBJ, DXF instead.
▶Will the X3D open at the right size?
X3D stores an explicit unit, so the model opens at true size without rescaling.
▶How large an SAT file can I convert?
Up to 200 MB, and the ceiling adapts to how much memory your device reports. The conversion runs on your own hardware, so a desktop with plenty of RAM will handle more than a phone.
▶Can I convert X3D back to SAT?
Yes, the other direction works too. Bear in mind that anything the first conversion dropped is not restored by converting back. X3D → SAT
▶Which browsers does it work in?
Chrome, Edge, Firefox and Safari, on Windows, macOS, Linux, iOS and Android. No plugin and no extension.
Convert SAT to something else
Convert something else to X3D
Or start from the universal 3D viewer.