DWG drawing files
DWG handoffs: file version, units, layouts, references and custom-object compatibility.
Tags: parts-and-design, file-formats, dwg, drawings, cad
On this page
What the file represents
DWG can carry drawings, blocks and 3D models. Check the saved file generation separately from the authoring release and application-specific objects. AutoCAD 2026, drawing-file changes
Autodesk’s 2026 table maps AutoCAD 2018–2026 to the 2018 DWG format and 2013–2017 to the 2013 format. Its AutoCAD 2016 sharing example uses the 2013 format. Autodesk format table and sharing example
For Civil 3D objects, a visible proxy does not establish editability. Autodesk’s 2026 Object Enabler FAQ describes limited editing through AutoCAD commands and no commands to create new intelligent objects. Verify the specific required edit in the target application. Export Civil 3D Drawing instead converts the objects to plain AutoCAD objects. Civil 3D 2026 drawing compatibility, Civil 3D 2026 Object Enabler FAQ
Record the authoring product/release, saved DWG format, required receiver application and revision. Identify whether the recipient needs editable objects, a manufacturing contour, model geometry, or a readable drawing. A successful open is only the first compatibility check.
Application release and file format differ
Agree the target format before conversion. Autodesk identifies SAVEAS for individual files and DWGCONVERT or eTransmit for multiple drawings. Reopen the result in the intended receiving application and compare the required content; selecting an older file format is not itself evidence that all application-specific semantics survived. Autodesk conversion methods
Custom objects need a separate decision
Before export or object conversion, decide which information must remain editable or queryable. Compare the required geometry, annotations and properties afterward. A visually correct proxy or flattened export does not demonstrate preservation of the original design intelligence.
Units and scale require a measured check
AutoCAD's INSUNITS specifies units for automatic scaling when blocks, images or xrefs are inserted or attached. Its documentation explicitly notes that annotative blocks ignore this setting. The block-unit documentation also identifies insertion factors and source/target defaults for unitless content. Record the actual insertion workflow and scale, not just one unit variable. INSUNITS, AutoCAD 2026, block units and insertion scale
Original conversion example: an intended 10 mm feature corresponds to 10/25.4 ≈ 0.3937008 inch. If the receiver interprets a numeric length of 10 as inches, the resulting physical length is 254 mm, a factor of 25.4 larger. This diagnoses a possible unit mismatch; it does not identify which setting or transformation caused it. Measure a known feature in the actual imported geometry before accepting the handoff.
Keep model geometry, viewport scale and plotted sheet scale distinct. Autodesk describes building the model at full size and creating scaled views in paper-space layouts. A dimension label or a visually correct sheet is not independent proof of the model's physical size. Autodesk layouts and scaled views
Package the dependencies and acceptance view
Autodesk's eTransmit guidance describes grouping drawings and supporting files into a folder or ZIP and converting to earlier formats. It also notes that objects exceeding legacy size limits can prevent conversion. Treat the actual package and conversion result as deliverables to inspect. AutoCAD 2026 electronic transmittal packages
As a proposed handoff checklist, include or resolve the following:
| Item | Acceptance question |
|---|---|
| Drawing and revision | Is this the released file and agreed saved format? |
| References | Do required xrefs, images and other linked resources resolve? |
| Presentation | Are required fonts, line types, plot resources and layouts reproduced? |
| Geometry | Are units, origin, orientation, extents and critical dimensions correct? |
| Functional content | Are required layers, blocks, attributes and specialized objects usable? |
Provide an agreed rendered reference, such as a PDF, when sheet appearance matters, and compare it with the receiving application's result. Identify the authoritative dimensional/model requirements separately from that visual reference. For a cutting profile, agree which space, layers and entities define the contour and check closure, duplicates and unintended geometry using the receiving process.
For an agent-readable record, retain authoring product/release, target format, revision, units, measured check feature, required dependencies, object-conversion decisions and receiving application. Preserve the original alongside a converted copy so differences can be resolved against the actual release intent.
Source scope
Reviewed on the date above. Version-specific claims refer to Autodesk 2026 Help, including Civil 3D 2026 where stated; the live AutoCAD Web layout page has no verified technical revision date. The conversion arithmetic and proposed acceptance/package checks are editorial guidance, not guarantees of any translator or manufacturing system.