Free Online ACIS SAT Viewer (No Signup)
Also opens DWG, DXF, STEP, IGES, IFC, SKP, STL, OBJ, GLB, FBX, 3DM and other 3D/CAD files. Drop any file on the viewer.
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What Is an ACIS SAT File?
ACIS is the 3D solid-modelling kernel made by Spatial. A kernel is the geometry engine inside a CAD program, and SAT is the file ACIS writes to exchange its models: a boundary representation (B-rep) of every solid and sheet body, made of faces, edges and vertices, with each face lying on an exact surface (a plane, cylinder, cone, sphere, torus or NURBS spline). SAT (Standard ACIS Text) stores it as text and SAB (Standard ACIS Binary) as binary. Autodesk products build on ShapeManager (ASM), Autodesk’s own branch of ACIS, and write the same kind of file, sometimes named .asat or .asab.
The viewer reads the file with its own ACIS reader, in your browser. It walks the topology of every body, places each body by its transform, and computes every face on its true surface before meshing it finely for display, so cylinders, cones, spheres, tori and freeform NURBS faces come out round and smooth. Files from early ACIS releases to ACIS 2023 open, along with Autodesk’s ASM variants, in text and binary. Colours come from the file, and the model opens in the units the file declares.
The model exports like any 3D model, for example to STL for 3D printing, STEP as a faceted solid, OBJ or GLB.
Who Uses ACIS SAT Files?
SAT is a common way to move solids between CAD programs. AutoCAD writes it with ACISOUT or Export, Revit exports it from its CAD export formats, and SolidWorks, Inventor, Fusion, SpaceClaim, Rhino and BricsCAD save it too; CATIA and other systems reach it through translators. Engineers, architects, fabricators and simulation analysts receive SAT files from partners and need to look at one without the program that made it. This page opens them in any browser, with nothing to install and no sign-in.
Common Use Cases
- Look at a SAT file someone sent without installing AutoCAD or another CAD program
- Check a solid exported from Revit, Inventor or SolidWorks before importing it
- Measure a distance or cut a section through a part
- Convert a SAT model to STL for 3D printing
- Convert a SAT model to STEP, OBJ or GLB for another program
- Save the view as a PDF or PNG for a review or a quote
Features
Opens SAT and SAB
Standard ACIS Text (.sat) and Standard ACIS Binary (.sab) files, and the .asat and .asab files Autodesk products write, loose or inside a .zip.
Exact Curved Surfaces
Planes, cylinders, cones, spheres, tori and NURBS faces are computed on their true surfaces, then meshed finely for display.
ACIS Versions to 2023
Files from early ACIS releases to ACIS 2023, and Autodesk ShapeManager (ASM) files in text and binary.
Every Body in Place
Each solid and sheet body is placed by its transform and becomes its own part in the model.
Colours and Units from the File
Bodies are drawn in the colours the file gives them, and the model opens in the units the file declares.
Measure and Section
Click two points to measure a distance, or cut the model with a section plane.
Convert to STL, STEP or GLB
Save the model as STL for printing, STEP (a faceted solid), GLB, OBJ, 3MF, USDZ, DXF or DWG, or the view as PDF or PNG.
Nothing Is Uploaded
The file is read and drawn entirely in your browser. No account, no upload, no copy of your design on a server.
Share and Embed
Send a link that opens the model in any browser, or drop the viewer into your own page with one iframe.
Compatibility & Format Notes
What is drawn: every solid and sheet body in the file, at its saved position, with faces on planes, cylinders, cones, spheres, tori and NURBS spline surfaces, trimmed by their edges. Each body becomes its own part in the colour the file gives it, and the units come from the file header.
Versions: SAT and SAB files from early ACIS releases to ACIS 2023, and Autodesk ShapeManager (ASM) files in text and binary, including the 64-bit ASM binary encoding.
Files: .sat, .sab, .asat and .asab, loose or inside a .zip. Converter pages: SAT to STL, SAT to STEP, SAT to OBJ and SAT to DWG.
Embed on Your Website
Add this viewer to your own site with a single line of HTML. Click Embed in the toolbar to generate an embed code, or use the snippet below with your own file URL.
Your Files Stay on Your Computer
Your ACIS SAT files are parsed entirely in your browser. Nothing is uploaded, stored, or shared unless you explicitly click the Share button. Shared files are hosted for 90 days then deleted.
Frequently Asked Questions
▶Do I need AutoCAD or another ACIS-based program installed?
No. The viewer reads the file with its own ACIS reader, in your browser. No CAD program needs to be installed, and no account is needed.
▶What is the difference between SAT and SAB?
They hold the same model. SAT (Standard ACIS Text) is written as readable text, and SAB (Standard ACIS Binary) as binary, which is smaller and faster to load. The viewer opens both, and the .asat and .asab files Autodesk products write.
▶Are curved faces drawn accurately?
Yes. Each face is computed on its exact surface (plane, cylinder, cone, sphere, torus or NURBS) and then meshed finely for display, so round parts look round. Exports carry that fine mesh.
▶How do I convert a SAT file to STL or STEP?
Open the file, then click Export and choose STL or STEP, or use the SAT to STL or SAT to STEP converter. The STEP file is a faceted solid built from the display mesh.
▶Is this ACIS SAT viewer really free?
Yes, completely free. No signup, no watermarks, no file size limits on the viewer (the optional share-link feature has a 100 MB upload cap). Built by Innerscene as a tool for architects, engineers, and designers.
▶Are my files uploaded to a server?
No. All parsing, rendering, and conversion runs in your browser: nothing is uploaded, stored, or transmitted by default. The Share button is the only feature that uploads a file, and only when you explicitly click it.
▶Can I convert to another format?
Yes. Click Export in the toolbar. The menu offers GLB, OBJ, STL, USDZ, 3MF, PLY, STEP (a faceted solid), DXF, DWG (converted on our server), 3DM, PDF, SVG, PNG and JPG.
▶Can I embed this viewer on my own site?
Yes. Click Embed in the toolbar to generate a one-line <iframe> snippet you can paste into any HTML page. You can choose whether the embed shows the viewer’s toolbar.
ACIS is a registered trademark of Spatial Corp., a Dassault Systèmes company. AutoCAD, Revit, Inventor and Fusion are trademarks of Autodesk, Inc. Innerscene is not affiliated with Spatial or Autodesk.