WebP to PNG
For the software that still will not open a WebP.
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Why you keep hitting this
Most images saved from the web are now WebP, and plenty of desktop software, older editors, some office suites, various uploaders, still refuses it. PNG is the safe universal answer, and it keeps transparency, which JPEG cannot.
The file will get larger. WebP compresses better than PNG at every quality level.
How much larger, and why
Expect two to five times the size for a photograph, and less of an increase for flat graphics and screenshots, where PNG's own compression works well. The reason is that WebP is allowed to discard information and PNG is not. A lossy WebP has already thrown away detail your eye was unlikely to miss; PNG then has to store the result perfectly, artefacts included, using a general-purpose lossless algorithm. You are paying full price for a picture that has already been reduced.
That is worth stating plainly because it is the thing people hope is not true: converting to PNG cannot undo what the WebP encoder did. If a WebP looks soft or blotchy around edges, the PNG will look identically soft and blotchy, and will take up several times the disk space doing it.
The two kinds of WebP
WebP has a lossless mode as well as a lossy one, and most images saved from websites are lossy while most exported from design tools are lossless. If yours is lossless, this conversion is genuinely free in quality terms: it is a straight re-packaging into a format everything can read, with no second generation of loss anywhere. Media info will tell you which you have.
Animated WebP
WebP can hold an animation, and PNG effectively cannot outside of the rarely-supported APNG format. Converting an animated WebP here gives you a single still frame rather than a moving picture, which is usually a surprise rather than a choice. For something animated, convert to GIF with images to GIF after extracting the frames, or keep the WebP.
One last thing worth checking before you convert: if the image has no transparency and the destination accepts JPEG, PNG is the wrong target entirely. Go to JPEG with the image converter and the file will be a fraction of the size, with no visible difference on a photograph.
Common questions
Is transparency preserved?
Yes. PNG carries an alpha channel, so transparent areas stay transparent.
Does converting improve quality?
No. If the WebP was lossy, its artefacts carry over unchanged.