QCAD – 2D computer-aided drafting software

QCAD is a 2D computer-aided design (CAD) application for creating technical drawings, including architectural plans, mechanical components, interior layouts and technical diagrams.

The application focuses on precise drafting rather than three-dimensional modelling. Its graphical interface combines geometric construction tools with accurate coordinate entry, object snapping and drawing organisation.

QCAD is suitable for beginners learning technical drawing as well as experienced users preparing detailed plans. Its modular architecture also makes it possible to develop custom drawing tools and automate repetitive operations.

This is free and open source software.

Key Features

• Create and edit points, lines, arcs, circles, ellipses, splines, polylines and other geometric entities.
• Organise drawings using layers and reusable blocks, including nested blocks.
• Precision drafting with object snapping to endpoints, intersections, centres, tangents and grid positions.
• Enter coordinates using absolute, relative, Cartesian and polar positioning.
• Modify geometry using move, copy, rotate, scale, mirror, trim, offset and stretch operations.
• Add linear, angular, radial and diameter dimensions to technical drawings.
• Measure distances, angles, coordinates, areas and circumferences.
• Create patterned hatches and solid fills with configurable scaling and orientation.
• Insert raster images and adjust their position, scale, rotation and transparency.
• Support for metric and imperial measurement units.
• Multiple drawing tabs, extensive entity selection tools and unlimited undo and redo.
• Use CAD-specific fonts, TrueType fonts and configurable line types and widths.
• Read and write DXF drawings, import basic SVG geometry and export drawings as PDF or raster images.
• Print drawings to scale with a print preview and paper selection.
• Extend functionality and automate drawing operations through an ECMAScript scripting interface and C++ plugins.
• Cross-platform support – runs on Linux, macOS, and Windows.

Website: qcad.org
Support:
Developer: Andrew Mustun and contributors
License: GNU General Public License v3.0

QCad is written in C++. Learn C++ with our recommended free books and free tutorials.

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