Upload an image, paint areas to keep visible. Unpainted areas become a 2×2 checkerboard pattern. Adjust brightness & retention for timeline preview. Export 4096px PNG with indexed transparency (2 values).
📱 timeline (downsampled)
🔓 opened (original pattern)
Upload an image to start
Brush keeps pixels opaque · Eraser makes them hidden (2×2 checker) · Export writes 4096px long edge with indexed transparency