PNG to WEBP

Yes. WEBP supports an 8-bit alpha channel, and the converter carries it across untouched. Soft drop shadows and anti-aliased edges render the same, unlike a JPG export where everything would flatten onto white.

No, it uses the browser's lossy WEBP encoder with a quality setting. The WEBP format does define a separate lossless mode, but canvas-based tools can't reach it. At High quality the difference is invisible for typical UI art; keep the PNG master if you need pixel-exact archives.

Illustrations and screenshots commonly drop 60 to 90 percent, far more than photos do, because flat color regions compress extremely well. An 800 KB hero graphic landing under 100 KB is a normal result.

Usually not worth it. Below a few kilobytes the savings are marginal, and crisp 1-pixel edges can pick up slight fringing from lossy encoding. Spend the effort on your large illustrations instead.

Yes, drag the lot in at once. Bulk mode processes files in order and returns one ZIP, so swapping an app's image directory is a single operation rather than an afternoon.

Low quality settings quantize smooth gradients into visible steps. Raise the preset to High, or use the fine-tune slider around 90%, and the banding disappears while still beating the PNG's size comfortably.

Use the WEBP to PNG tool on this site. You'll get a lossless copy of the WEBP's pixels, though detail the lossy encoder removed is gone for good, which is another argument for keeping source PNGs somewhere safe.