Guide

How to open a DWG file without AutoCAD

Someone sent you a .dwg and you do not have AutoCAD. Here are five free ways to open it, what each one needs, and where each one falls short.

Short answer

If you just need to look at the drawing, open it in this free browser viewer. It works on Windows, Mac, Linux and phones, needs no account, and the file never leaves your device.

1. In the browser, with no upload

dwg.moonforge.tech reads the DWG with GNU LibreDWG compiled to WebAssembly, directly in your browser tab.

Needs: a current browser (Chrome, Safari, Firefox, Edge), on any system.
Good at: quick viewing, layers on and off, privacy (no upload, no account), open source.
Falls short: viewing only for now, no printing or measuring yet. Text uses an open font, so it can look a little different from AutoCAD. Some complex objects from recent DWG versions may not show.

2. DWG TrueView (Windows)

Autodesk's own free desktop viewer and converter.

Needs: Windows. The 2027 version requires 64-bit Windows 11, 8 GB RAM and 4 GB of disk space. It does not install on macOS.
Good at: the most faithful rendering, since it is Autodesk's code, plus converting between DWG versions.
Falls short: Windows only, a large download and installation.

3. Autodesk Viewer (online)

Autodesk's browser-based viewer.

Needs: an Autodesk account.
Good at: faithful rendering on any system, sharing a view with others.
Falls short: the file is uploaded to Autodesk's servers in the US and kept for 30 days by default. Not an option for drawings you are not allowed to hand to a third party.

4. ODA Viewer (desktop)

A free desktop viewer from the Open Design Alliance, the consortium that develops DWG libraries for CAD vendors.

Needs: installing an app. Downloads are offered for Windows, macOS and Linux.
Good at: works offline on all three desktop systems, handles many formats.
Falls short: ODA presents it as a tool for rendering and testing its technology, and the interface shows it: it is aimed at developers more than at someone who just wants to look at a plan.

5. LibreCAD (desktop, open source)

A free, open-source 2D CAD program for Windows, macOS and Linux that works natively with DXF.

Needs: installing an app.
Good at: editing DXF drawings with a real CAD program at no cost.
Falls short: DWG is import only, and its DWG library calls that support rudimentary. Newer or complex files often fail.

What about my phone?

Open dwg.moonforge.tech in Safari or Chrome on the phone and pick the file from Files or your downloads. Pinch to zoom, drag to pan. Big drawings take longer on a phone than on a laptop, but nothing is uploaded either way.

What if nothing opens it?

Ask the sender to save the drawing as DXF or an older DWG version (for example 2013 or 2018). Almost every CAD program can do that in the Save As dialog.
If you only need to print or annotate, ask for a PDF export.
If the file might be damaged, it will usually fail everywhere. That is worth telling the sender.

Which one should I use?

Situation	Use
Quick look, any computer or phone, private drawing	Browser viewer
Windows PC, need exact AutoCAD rendering or version conversion	DWG TrueView
Need to share a view with a colleague and uploading is fine	Autodesk Viewer
Need to edit, open-source only	LibreCAD, with the file saved as DXF

Sources

Checked on 2026-09-17.