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IDW File

Autodesk Inventor Drawing
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Verified by Adam B.· reviewed by FE Editorial ·updated Aug 7, 2026 3.3 (13 votes) Thanks for rating!
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An IDW file is a 2D engineering drawing made in Autodesk Inventor - it holds dimensioned views, sections, and a title block documenting a 3D part (.ipt) or assembly (.iam). The free Autodesk Viewer at viewer.autodesk.com opens an IDW in any browser without Inventor. To share it, export to PDF; for other CAD programs, export to DWG or DXF. IDW is version-locked: a file from a newer Inventor will not open in an older one.

Developer: Autodesk Category: CAD Files MIME: application/octet-stream
OPENS ON Windows macOS Web
Related: .DWG · .SLDPRT · .EASM · .NWD

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Last reviewed Aug 7, 2026

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What is the IDW file format?

.idw files are associated with Autodesk Inventor software. They store 2D engineering drawing data - sheet layouts, projected views, section cuts, detail views and annotations - that reference external 3D models rather than containing 3D geometry directly. Autodesk Inventor is parametric modeling software for designing, simulating and visualizing mechanical parts and larger assemblies.

Autodesk Inventor saves project data across several complementary file formats:

  • .idw - 2D engineering drawings (this format)
  • .ipt - individual part models
  • .iam - assembly projects combining multiple parts
  • .ipn - presentation files for exploded views and animation

.idw files are typically converted to .dwg format, compatible with Autodesk AutoCAD and widely accepted by manufacturers and suppliers. Autodesk now recommends saving Inventor drawings directly as .dwg; the .idw format remains fully supported but .dwg is the interoperable default in current releases.

Tools - including Inventor's own iLogic scripting and third-party utilities - allow batch processing of .idw files to update title blocks, revise part references or export entire drawing sets automatically.

Security & safety

RISK: LOW

An IDW is CAD drawing data, not an executable, so opening one in Inventor or the Autodesk Viewer is safe. Realistic concerns are non-malware: an IDW references external .ipt/.iam models, so a file received without its models will show blank/'resolve' views; and a production drawing can expose exact, dimensioned manufacturing detail - treat shared files as sensitive IP. Download Inventor and the Autodesk Viewer only from autodesk.com to avoid fake 'IDW viewer' adware sites.

Format details

in a nutshell
FULL NAMEAutodesk Inventor Drawingaka Inventor Drawing, IDW drawing
DEVELOPERAutodesksince 1999 (Autodesk Inventor 1.0)
CATEGORYCAD Files
MIME TYPEapplication/octet-stream
TYPEProprietary binary 2D engineering drawing (OLE2 compound file, version-specific)
RELATED.dwg.sldprt.easm.nwd
MAGIC BYTES · FILE SIGNATURE
OFFSET
0001020304050607
HEX
D0CF11E0A1B11AE1
ASCII
········
IDW files are Microsoft Compound File Binary (OLE2 structured-storage) containers, so they share the D0 CF 11 E0 A1 B1 1A E1 signature with old Office files and other Inventor types (.ipt/.iam/.ipn). Internal streams identify it as an Inventor drawing; the format is proprietary and version-specific.

Programs that open IDW files

Windows4 apps
Autodesk Inventor Paid File > Open the .idw to view, edit and print the drawing with full associativity. Subscription product.
Autodesk Viewer (web) Free Upload the .idw in a browser (free Autodesk account) to view, measure and print without Inventor - best free option.
Inventor View / Inventor Read-Only Free Legacy free Inventor viewer for opening .idw/.iam/.ipt read-only; largely superseded by the web Autodesk Viewer.
Autodesk Fusion Freemium Upload the .idw via Fusion Team / Drive to view it; Fusion's own drawings differ but it reads Inventor data. Free for personal use.
macOS1 app
Autodesk Viewer (web) Free Inventor has no native macOS app - use the browser-based Autodesk Viewer to view and print an .idw on a Mac.
Web1 app
Autodesk Viewer Free Drag the .idw onto viewer.autodesk.com to view, measure and share - no install, any OS.

Technical details

deep spec
Container formatOLE2 / Microsoft Compound File Binary (CFBF) structured-storage container
EncodingBinary, little-endian byte order
File signatureD0 CF 11 E0 A1 B1 1A E1 at byte offset 0 (standard OLE2 header, shared with other Inventor file types)
Content type2D engineering drawing: sheets, base/projected/section/detail views, dimensions, GD&T annotations and title block data
Model dependencyDrawing views reference external .ipt (part) or .iam (assembly) files; missing references result in blank or unresolved views
Internal versioningVersion-locked to the Inventor release that saved the file; newer Inventor opens older IDW files, older Inventor cannot open newer IDW files
Typical file size200 KB - 20 MB, growing with sheet count, view complexity and embedded model detail
CompressionProprietary internal stream packing inside the OLE2 container; not a general-purpose compressed archive
EncryptionNone - no native password protection on the drawing file itself
MIME typeapplication/octet-stream (no registered vendor MIME type for IDW specifically)
Platform supportWindows only for native editing in Autodesk Inventor; read-only web viewing available via Autodesk Viewer
Export formatsDWG, DXF, DWF, PDF - DWG is the recommended interoperable output for sharing with AutoCAD users
Superseded byAutodesk recommends .dwg as the default Inventor drawing format for interoperability; IDW remains fully supported in current releases
Automation supportInventor API (COM) and iLogic scripting enable batch operations: updating title blocks, exporting sheets and re-referencing part models
Released1999 (Autodesk Inventor 1.0)
Latest versionTied to the current Autodesk Inventor release (e.g. Inventor 2026); IDW is the legacy native drawing format, DWG is the modern alternative
Specificationwww.autodesk.com

IDW conversions

Possible
.IDW .PDFGUIDE
Yes -- the fastest free method is Autodesk Viewer (browser): upload the IDW, then use Print > Save as PDF to…
How to convert
.IDW .DWFGUIDE
Yes - open the IDW in Autodesk Inventor and use File > Export > Publish to DWF to produce the DWF file in…
How to convert
.IDW .DWGGUIDE
Yes - open the IDW in Autodesk Inventor and use Export > Export to DWG; it is the only reliable path.
How to convert
.IDW .DXFGUIDE
Yes, Autodesk Inventor exports IDW sheets to DXF directly; it is the only practical way to do this conversion.
How to convert
Not possible
.IDW .IGESWHY NOT?
No -- an IDW is a 2D drawing; IGES requires 3D solid geometry that the drawing does not contain.
.IDW .STLWHY NOT?
.IDW .STPWHY NOT?
.IDW .IAMWHY NOT?
No - an IDW and an IAM are fundamentally different kinds of file. No converter exists or can exist for this…

Community Q&A

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Frequently asked questions

How do I open an IDW file without Inventor?
Upload it to the free Autodesk Viewer (viewer.autodesk.com) in a browser to view, measure and print it - no Inventor needed, works on any OS including Mac. The legacy free Inventor View / Read-Only viewer also opens IDW on Windows.
Why won't my IDW file open in Inventor?
Usually a version mismatch - the drawing was saved in a newer Inventor than yours, and older Inventor can't open newer files. Use the same/newer Inventor, ask the author to save down or export PDF/DWG, or view it in the web Autodesk Viewer.
Why are the views in my IDW blank?
An IDW only references the 3D model; it doesn't embed it. If the associated .ipt/.iam files are missing or moved, the drawing views can't resolve. Get the model files from the sender and keep them together.
How do I convert an IDW to PDF?
Open it in Inventor and use Export > PDF (or print to a PDF printer) to output all sheets at scale. You can also upload the IDW to the free Autodesk Viewer and print to PDF from there.
What's the difference between IDW and IPT/IAM?
An .ipt is a single 3D part and an .iam is a 3D assembly; an .idw is the 2D drawing that documents them with dimensioned views and a title block. The drawing references the model, not the other way around.
Should I use IDW or DWG for Inventor drawings?
Both work in Inventor. IDW is the older native format; DWG is Autodesk's preferred, more interoperable drawing format that opens in AutoCAD too. For sharing outside Inventor, DWG or PDF is usually better.

References

1Autodesk - Inventor (product/overview)www.autodesk.com
2Autodesk Viewer (free online viewer)viewer.autodesk.com

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