Testing product photos one at a time stops being practical once a catalogue reaches a few dozen items. This checker runs the same tests as the single image checker across a whole batch, so you can see which photos could cause trouble before you start uploading.
Everything happens in your browser. The ZIP is opened on your device and no photo is sent to a server, so unreleased products stay private.
What the fix can and cannot change
The fix handles shape, pixel size and file limit, following the same rules as Fix All on the single checker. It cannot repaint a background behind a product. If photos still fail the background test after fixing, run them through the bulk background remover and check them again.