Drop one or more .jpg / .jpeg files. The page decodes them (honouring EXIF orientation), draws a canvas, and exports PNG. The list shows the output name once the row is done — photo.png, not photo.jpg.
Max width
Original keeps the pixel size. 1920, 1280, 800 and 640 scale down proportionally. Nothing is enlarged.
Batch
Twenty files at a time. ZIP appears when two or more PNGs are ready. Extra files in a huge drop are skipped with a note under the list.
Change max width and press Convert again to redo the same files. Nothing is uploaded at any step.