WebP to PNG

// Why the image you saved from a website won't open

WebP is what modern websites serve because it is around 25 to 35 percent smaller than JPG or PNG at similar quality. Save one of those images to disk, though, and the trouble starts: older image editors, office software, and a surprising number of upload forms still refuse the format. The file is fine; the software just predates it.

PNG has none of that problem. It has been the universal lossless format for decades, everything opens it, and it carries a full alpha channel, so any transparency in the WebP survives the trip. Converting to PNG is the compatibility fix, not a quality upgrade.

// What the conversion does and does not do

Every modern browser decodes WebP natively, so no extra decoder is needed. The tool reads the file, draws the decoded pixels to a canvas, and exports a PNG. From that point forward the image is lossless: nothing else will degrade it, no matter how many times it is opened or re-saved.

What the conversion cannot do is recover detail. If the WebP was lossy encoded, the discarded detail is gone, and the PNG faithfully preserves the image as it is now. Expect a larger file, and note that the canvas re-encode strips any metadata the WebP carried.

// fair questions

Is my image sent anywhere during conversion?

No. Every step runs inside your browser on your own hardware, so the WebP never leaves your device and no server sees it. The tool even works offline once the page is loaded.

Does transparency survive the conversion?

Yes. PNG supports a full alpha channel, so transparent and semi-transparent regions in the WebP come through intact. If you specifically need a flattened image instead, convert to JPG rather than PNG.

Will converting to PNG restore the original quality?

No. If the WebP was saved with lossy compression, that detail was discarded before you ever downloaded it. PNG guarantees zero loss from here on, which is different from undoing loss that already happened.

Why is the PNG larger than the WebP was?

WebP achieves roughly 25 to 35 percent smaller files than PNG at similar quality, so reversing the direction costs you that saving. Lossless PNG keeps every pixel value, and photographic content in particular gets noticeably bigger.