Guide · projection mapping for Mac and WindowsFree projection mapping software
Map live visuals onto walls, boxes, columns and stage sets – free, with several projectors, and run by the light desk.
Short answer
In VJ-Link choose OUTPUT → Projection mapping. On the picture of each projector you lay canvases and drag their corners onto the wall, the box or the column. Curved surfaces get a 3×3 or 5×5 grid, doors and people are blacked out with masks. Each canvas can show its own picture with its own layers.

Projection mapping step by step
- Connect the projector and open it under OUTPUT as an output.
- Choose the arrangement Projection mapping and add a canvas with + Canvas.
- Drag the four corners onto the edges of the surface. Arrow keys move a point by 1 pixel.
- Switch on Grid for alignment: the grid test pattern lies distorted on the canvas, so the edges can be matched exactly.
- For round surfaces choose the shape grid 3×3 or 5×5, for doors and windows add a mask.
- Put a stage photo behind the canvases as a guide – it never goes to the projector.

Several projectors and LED walls
Every connected projector, screen or LED processor can be an output in its own resolution. As a canvas the picture runs seamlessly across all of them; in projection mapping each projector gets its own canvases. Up to five pictures with their own layers can be distributed onto the canvases, and scenes recall all of them at once.

Questions
Is the projection mapping really free?
Yes. Projection mapping is part of VJ-Link, which is free and open source (EPL 2.0), without watermark or limits.
How many projectors can I use?
As many as the computer can connect; each output has its own resolution. A window output can be captured in OBS instead.
Can a light desk control the mapping?
Yes. DMX channels 71–91 set the brightness of the pictures and the opacity of their layers; scenes switch all canvases at once.
Free for macOS and Windows
VJ-Link is free and open source (EPL 2.0). Install it, open the demo show and you have live visuals in minutes.