Freehand Georeferencer
An intuitive georeferencing (coordinate-correction) tool for vector and raster layers. Grab a point and release it at the new position to add control points, preview the Helmert/Affine transform in real time, and apply the result.
Align survey/CAD-derived vector data or scanned/old raster maps to known points with a direct, PowerPoint-like feel (move, rotate, scale). No numeric input is required: control points (GCPs) are added with the mouse only. For vector layers, press an old node and release at the new position; sources snap to vertices of any visible vector layer. For raster layers, press a recognizable point on the image and release at its correct map position (free-point source; the image itself has no vertices). The transformed geometry/image is previewed in real time while dragging. Per-GCP X/Y error, overall RMS, standard deviation and scale factor are shown; residuals are colored green-to-red and the list is sortable. Transforms: Helmert (fixed scale or with scale) and Affine. Apply: vector -> new memory layer, add to current layer, or in-place edit (undoable); raster -> a new georeferenced layer written as a VRT with an updated geotransform (no resampling, lossless). GCPs can be saved/loaded as CSV. Same-CRS workflow only (no reprojection): keep the layer CRS and the project CRS identical; a warning is shown when they differ. Acknowledgment: the interactive UI (grab a point and move it to add control points) is inspired by the "Freehand Raster Georeferencer" plugin by Guilhem Vellut (https://github.com/gvellut/FreehandRasterGeoreferencer); licensed under GPL v2 or later, this plugin is distributed under GPL v3.