Drop JPGs above, download PNGs. Fair warning: files come out larger. PNG is lossless, and losslessness costs bytes; what those bytes buy is an image that will survive any number of further saves.
The right reasons:
- About to edit. JPG loses quality on every save; edits compound it. Convert to PNG, edit freely, export a JPG once at the end. One compression pass instead of five.
- A system demands PNG: some uploaders and print services accept nothing else.
- Archiving a finished image against future accidental compression.
What conversion cannot do:
- Restore quality. JPG artefacts are baked into the pixels; PNG preserves them faithfully and adds none.
- Create transparency. There's none in a JPG to recover. The PNG keeps the same solid background. Removing one is the background remover's job, linked below.
Size, concretely: photos typically grow 5–10×. A 300KB JPG becomes a 2–3MB PNG. Normal. Want the opposite trade? PNG to JPG and PNG to WebP go the other way.
Colour values and orientation come through unchanged, leaving the PNG a faithful record of the JPG as it stood at the moment you converted it.
Dimensions are unchanged, the original JPG is never modified, and batches come back as a ZIP.