Sketchgauge: free online 2D parametric sketch tool

Sketchgauge lets you draw a 2-D sketch from points, lines, arcs and circles and then control it with numbers and rules. Add a dimension (distance, angle, radius) or a geometric constraint (coincident, parallel, perpendicular, tangent, horizontal, vertical, equal) and a numerical solver moves the drawing until every rule holds. Drag a point and the sketch follows, staying inside the rules you set.

A status line reports the degrees of freedom: how much of the sketch can still move. A sketch is under-constrained, fully constrained or over-constrained, and redundant or conflicting constraints are named. A drawing sheet adds a title block, a scale, dimensions measured from the drawn geometry and geometric-tolerance frames, and exports go to DXF (R12 ASCII) and SVG. Everything runs in your browser and nothing is uploaded.

What Sketchgauge can do

• Draw points, lines, circles and arcs and edit their coordinates in a table
• Add dimensions (distance, horizontal and vertical distance, angle, radius, diameter) and reference dimensions
• Add coincident, parallel, perpendicular, tangent, horizontal, vertical, equal, concentric, midpoint and fix constraints
• Read the degrees of freedom and see which constraints are redundant or conflicting
• Lay out a drawing sheet with a title block, a scale, dimensions and geometric-tolerance frames
• Save and open JSON, import simple DXF files and export DXF R12 or SVG

How we verify Sketchgauge

Sketchgauge is checked against 41 reference cases. Where a reference answer exists you can run every check yourself on the Verify page, and the Sketchgauge user guide documents every feature and limitation.

Sketchgauge is part of Open Tools, the free engineering tools that run in your browser.