Upload a clean transparent PNG or SVG of the your logo, then add your event photos. Adjust grid and blending, then export a high resolution PNG. All work is done in your browser.
Tip: columns x rows decides tile size. More tiles gives a sharper logo but smaller photos. For 50 photos, 50 to 120 tiles per side works well for A3 print.
The preview is the real output at the size you set. Download will save exactly what you see.