Why convert PNG to WebP?
PNG is lossless, which makes photos and detailed cut-outs heavy. WebP supports transparency like PNG, but its lossy mode stores the same picture in far fewer bytes. A transparent product photo that is several megabytes as PNG can often become a small fraction of that as WebP, with the soft edges intact.
That makes WebP a strong choice for product images, hero graphics and illustrations on websites.
Transparency and quality
Transparent and semi-transparent pixels carry over to the WebP, so shadows and anti-aliased edges look right on any background. The conversion is lossy, set by the quality slider. At the default of 90 percent most images look the same as the PNG.
Flat graphics with sharp text, such as logos and screenshots, are the exception. Lossy compression can soften their edges. Check them with the compare slider, and keep logos as PNG if you need them pixel-perfect.
How to convert PNG to WebP
Upload the PNG, adjust the quality if you want a smaller file, and compare the result. The new size appears next to the original, along with the percentage saved. Download the WebP when you are happy with it.
PNG vs WebP at a glance
PNG is lossless, supports transparency and opens in practically every app, but photos and detailed graphics make large files. WebP, as created here, is lossy, supports transparency and works in all current major browsers, with much smaller files for photos and detailed graphics. Use WebP for images on websites and keep the PNG as your editable original.
For a batch, the Bulk Image Compressor with WebP output converts up to 20 PNGs at once and keeps their transparency. If a converted image is still bigger than you'd like, resize it to its display size first with the Image Resizer.