About WebP to PNG
Almost everyone arriving at this conversion has the same problem: an image saved from a website turned out to be a `.webp`, and the program they want to use will not open it.
WebP is Google's image format and it is genuinely good — typically 25–35% smaller than JPG or PNG at matched quality, with transparency support. Every current browser handles it, which is why sites serve it. The trouble is everything that is not a browser. Older versions of Photoshop, plenty of print workflows, some content management systems, various phone gallery apps and a good deal of enterprise software still refuse it outright.
Converting to PNG solves that, because PNG is opened by essentially everything written in the last twenty-five years.
Transparency is preserved. This is why PNG rather than JPG is the right target here. Many WebP images — logos, icons, product cutouts — carry an alpha channel, and converting them to JPG would flatten it onto a solid colour. PNG keeps it intact. If your WebP has no transparency and you only want a widely-openable file, JPG will be considerably smaller.
Expect the file to get bigger, sometimes much bigger. WebP is efficient; PNG is lossless and is not. A 200 KB WebP photograph can easily become a 2 MB PNG. Nothing has gone wrong — you have traded compression for compatibility, which is the entire point of the conversion. If size matters more than universal support, convert to JPG instead.
Quality does not change. PNG stores exactly what it is given. Whatever the WebP looked like, the PNG looks identical. No further loss is introduced, though the loss already baked into a lossy WebP cannot be undone.
Animated WebP produces only the first frame. Animation is not carried over.
Everything runs in your browser, so nothing is uploaded and there is no file-size queue.
Questions
Why will nothing open my WebP file?
WebP is well supported in browsers but not in a lot of desktop and print software. Converting to PNG makes it universally openable.
Is transparency kept?
Yes. PNG supports alpha, which is why it is the right target. Converting to JPG instead would flatten transparency onto a solid colour.
Why is the PNG so much larger than the WebP?
WebP compresses efficiently; PNG is lossless and cannot. Ten times larger is normal for photographs. You are trading size for compatibility.
Does it keep animated WebP animated?
No. Only the first frame is converted.
Are my images uploaded?
No. Conversion happens entirely in your browser.