Where converting WebP to JPG is about compatibility at any cost, converting to PNG is about compatibility without cost. PNG is lossless, so nothing further is thrown away, and it keeps the transparent background that a JPEG would have destroyed. If the image is going into an editor, a design tool, or anywhere it will be worked on rather than merely viewed, PNG is the right target.
Transparency is the deciding factor
A great many WebP files saved from the web are cut-outs: product shots on transparent backgrounds, logos, icons, sticker art. WebP stores a full alpha channel and so does PNG, which means the conversion is a clean handoff. Soft edges stay soft, drop shadows stay smooth, and nothing ends up sitting in an unwanted white or black box. Convert one of these to JPEG instead and that transparency is gone permanently.
Nothing further is lost — but nothing is recovered either
PNG stores exactly the pixels it is handed. If the source WebP was lossy — most photographic WebP files are — its compression artifacts become permanent pixel values in the PNG. The conversion is faithful, not restorative. What it guarantees is that from this point on, every edit and re-save leaves the image untouched, which is precisely what you want before starting work on it.
The file will get considerably larger
- Photographic WebP to PNG: expect five to fifteen times larger. WebP is very efficient on photographs and PNG is not efficient on them at all.
- Logos and flat graphics: usually a more modest increase, sometimes barely any, because PNG compresses large areas of identical colour well.
- Screenshots sit between the two, depending on how much photographic content they contain.
Animated WebP becomes one still frame
PNG has no animation support in its standard form, so an animated WebP converts to its first frame only. APNG exists and can hold animation, but it is a separate format and not what a program expecting a PNG will necessarily handle. If you specifically need the animation, this is not the conversion you want.
When PNG is the wrong choice
If the image is a photograph destined for a web page, converting WebP to PNG makes it dramatically heavier for no benefit. PNG earns its place when you need losslessness for editing, when a program refuses WebP, or when transparency must survive. For simply viewing or emailing a photo, JPG is smaller and just as widely supported.
The decode and re-encode both happen in this browser tab, on your own machine. No copy of the image is sent anywhere, so converting confidential screenshots or unreleased artwork carries no exposure.