DWG is AutoCAD's native binary format. It stores 2D and 3D drawings — entities, layers, blocks, styles, viewports — and is the most common engineering drawing format on Earth.

Which AutoCAD versions does this viewer support?

libredwg-web targets the AutoCAD R2000 through R2018 revisions (header magic AC1015 through AC1032). Very old (pre-2000) and brand-new (post-2018) revisions may decode partially or fall back to the inspector preview.

What does this viewer actually render?

We render model-space entities as a flat 2D canvas drawing — lines, arcs, circles, ellipses, polylines, points, and TEXT/MTEXT labels — with per-layer visibility toggles. Blocks (INSERTs), hatches, dimensions, and 3D geometry are not fully expanded; convert to DXF or PDF if you need authoritative rendering.

No. Files are opened entirely in your browser using local JavaScript and WebAssembly. Nothing is sent to a server.

Does it work on mobile?

Yes. The layer panel uses 44px-tall touch targets and the canvas supports pinch-to-zoom and drag-to-pan via pointer events.

DWG viewer — open .dwg in your browser

About DWG

AutoCAD native drawing.

DWG is AutoCAD's proprietary binary drawing format and the de facto standard for 2D CAD in architecture, engineering, and manufacturing. We decode it in your browser using libredwg-web (a WebAssembly port of GNU LibreDWG), then walk the model-space entities — lines, arcs, circles, ellipses, polylines, splines, points, and text — onto a 2D canvas. The layer table powers a side panel with per-layer toggles and ACI colour swatches; layers marked off or frozen in the file are pre-hidden to match the original view. Geometry that LibreDWG can't decode (very old or very new revisions, partial files) falls through to a structural inspector that shows the ACAD version magic and embedded strings.

FAQ

What is a DWG file?: DWG is AutoCAD's native binary format. It stores 2D and 3D drawings — entities, layers, blocks, styles, viewports — and is the most common engineering drawing format on Earth.
Which AutoCAD versions does this viewer support?: libredwg-web targets the AutoCAD R2000 through R2018 revisions (header magic AC1015 through AC1032). Very old (pre-2000) and brand-new (post-2018) revisions may decode partially or fall back to the inspector preview.
What does this viewer actually render?: We render model-space entities as a flat 2D canvas drawing — lines, arcs, circles, ellipses, polylines, points, and TEXT/MTEXT labels — with per-layer visibility toggles. Blocks (INSERTs), hatches, dimensions, and 3D geometry are not fully expanded; convert to DXF or PDF if you need authoritative rendering.
Is my file uploaded?: No. Files are opened entirely in your browser using local JavaScript and WebAssembly. Nothing is sent to a server.
Does it work on mobile?: Yes. The layer panel uses 44px-tall touch targets and the canvas supports pinch-to-zoom and drag-to-pan via pointer events.

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