Why convert JPG to PNG
The honest answer is that most people who want this conversion do not need it. PNG is lossless, so converting a JPG to PNG preserves the JPEG artifacts perfectly rather than removing them — you get a larger file containing exactly the same flaws. There are two cases where it genuinely helps: a piece of software or an upload form that accepts only PNG, and an image you are about to edit repeatedly, where working in a lossless format stops each save from degrading it further.
What this conversion costs you
- The file grows, often several times over. Lossless compression cannot approximate, so a 400 KB JPEG can become a 3 MB PNG carrying the same visible picture.
- No quality is recovered. Detail JPEG discarded is gone. PNG faithfully preserves the compressed result, including any blockiness or smudging already present.
When not to do this
Do not convert in the hope of sharpening or restoring a low-quality JPEG — nothing about the picture improves. If the goal is a smaller or cleaner file, this is the wrong direction entirely.
Common questions
Does converting JPG to PNG improve quality?
No. PNG stores exactly what it is given, which here is an image JPEG has already compressed. The artifacts are preserved perfectly along with everything else.
Why did my file get so much bigger?
PNG is lossless and cannot approximate anything, so it needs far more space to describe the same picture. Several times the original size is normal.
When is this conversion actually worth doing?
When something you must use accepts only PNG, or when you are about to make repeated edits and want to stop each save from compounding the loss.