What this conversion does and does not do
It is worth being clear about the limits. Converting a JPG to PNG does not restore detail, sharpen edges or remove compression artefacts. Whatever the JPG looks like is exactly what the PNG will contain, stored in a format that will not degrade it further.
What it does give you is a stable working copy. Every time a JPG is opened, edited and saved, it is compressed again and loses a little more. A PNG can be saved a hundred times with no change at all.
Good reasons to convert
- A tool requires PNG. Some design software, print services and web platforms accept nothing else.
- You are about to edit. Working in PNG avoids stacking compression damage across several saves.
- You plan to add transparency. Removing a background needs a format that can store one, which JPG cannot.
- The image is mostly flat colour. Charts, diagrams and simple graphics often come out smaller as PNG, not larger.
Why PNG files are larger
PNG compresses by finding repetition, in the way a zip file does, and never discards anything. Photographs contain almost no exact repetition, since every pixel differs slightly from its neighbours, so there is little for the format to compact.
JPG takes the opposite approach and throws away what you are unlikely to notice. That is why it wins so heavily on photographs, and why PNG wins on a screenshot full of flat white and solid text.
Frequently asked questions
Does converting to PNG improve the quality?
No. The detail a JPG discarded when it was first saved is gone for good. PNG preserves what is left perfectly, but it cannot bring back anything that was already lost.
Will my file get bigger?
Usually yes, often several times over. PNG stores every pixel exactly, so a photograph that fitted in 200KB as a JPG can become a megabyte or more.
Does this add a transparent background?
No. Transparency has to exist in the image already. A JPG has none, so the converted PNG has a solid background exactly like the original.
When is this conversion worth doing?
When a tool or platform accepts PNG only, when you are about to edit the image repeatedly and want no further loss, or when you need to add transparency in an editor afterwards.
Should I use PNG for photographs on a website?
Generally no. PNG photographs are large and slow to load. JPG or WebP are better suited, with PNG reserved for logos, icons and screenshots.
Will editing a PNG repeatedly degrade it?
No, and that is the main advantage. Each save stores the pixels exactly, whereas repeatedly saving a JPG compounds compression artefacts every time.