MLightCAD Viewer review
A capable open-source browser viewer for measuring, marking up, and editing CAD drawings.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
MLightCAD Viewer is an open-source, browser-based CAD viewer and editor for people who need to inspect, measure, annotate, or make direct changes to DWG and DXF drawings. It runs parsing and rendering in the browser without a backend service, while supporting desktop, tablet, and mobile interfaces. The feature set is aimed at drawing review and light editing rather than a broad, full CAD production workflow, making it a practical fit for users who want an accessible web tool for technical files.
Its strongest area is the combination of measurement and markup. Users can measure distance, area, angle, coordinates, and arc length, then add arrows, text, clouds, shapes, and callouts. Markups can be imported or exported through JSON sidecar files, which gives review annotations a defined exchange format. Layer management and switching between model space and paper space add useful navigation for drawings with multiple presentation contexts. Direct creation, editing, and deletion of drawing entities extends the product beyond a read-only viewer.
The browser-first design also shapes where MLightCAD Viewer fits. Self-contained offline HTML export supports sharing a portable view, and the product can be embedded into other web applications. At the same time, users who require a native desktop workflow or a more expansive CAD authoring environment should look elsewhere. Choose MLightCAD Viewer for open-source DWG/DXF review, measurement, markup, and focused entity editing across responsive web devices; choose an alternative when native-app workflows or broader CAD production capabilities are the priority.
MLightCAD Viewer pros and cons
- Where it wins
- Opens DWG and DXF files with client-side parsing and rendering
- Combines measurement, markup, and drawing-entity editing tools
- Exports drawings as self-contained offline HTML files
- Where it doesn't
- Web-only access may not suit users seeking a native desktop application
- Markup exchange relies on JSON sidecar files
- Offline sharing centers on HTML export rather than a broader export set
MLightCAD Viewer fact sheet, pricing and score →
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