Images are combined in the order they appear in the file list. To change order, remove a file and add it again in the desired position (same as Merge PDFs).

Images are scaled (keeping their aspect ratio) so rows line up flush with no leftover background bands. Grid balances the rows automatically — 5 images at 3 per row become a tidy 2-over-3 collage instead of one very wide strip.

Spacing adds gaps between images; the background color fills those gaps. Max output width caps the final image size so merging large photos stays fast — lower it if processing is slow, raise it for more detail.