Grid Mapper is a test pattern generator for LED screens and video projection. It runs on Windows and macOS without an internet connection. Patterns can be exported as PNG images or transmitted over NDI at 50 or 60 frames per second.
The application helps verify geometry, scale, panel layout and image proportions when setting up screens and projectors.
- LED panel dimensions in millimetres and pixels, with panel size and pixel pitch presets.
- Colour profiles, checkerboard fills, grids, panel IDs, diagonals and reference circles.
- Multiple screens on a shared Canvas, with snapping, layer ordering and precise positioning.
- Individual panel masking and a reference image overlay for building custom screen layouts.
- An information block with the screen name, dimensions, resolution, logo and grayscale bar.
- Individual screen or Canvas export to PNG, with transparency support.
- An independent NDI output for each screen.
- Project saving, undo/redo and built-in arithmetic in numeric input fields.
- English and Russian interfaces, with support for user-created translations.
