PNG to WebP Converter

For photographs, dramatically smaller: a median of 8% of the original across 30 test images at quality 85, with a worst case of 15%. For flat artwork the gain is far more modest — a test interface mock-up only dropped to 55% — because PNG already compresses large areas of identical colour extremely well.

Set the quality slider to 100. Chrome and Edge respond to a quality of exactly 1.0 by switching to the lossless VP8L encoder; in a test image the output grew from 30 KB at 99 to 74 KB at 100 and the internal chunk changed accordingly. Below 100 you always get lossy WebP, and other browsers may behave differently.

Yes, in both modes. WebP stores a full 8-bit alpha channel whether it is compressing lossily or losslessly, so logos, cut-outs and drop shadows keep their soft edges instead of picking up a white box the way a JPEG would.

In a browser, effectively yes — every current release displays WebP. Off the web it is less certain: some e-mail clients, older office suites, a few upload validators and parts of the print world still reject the extension. Keep the PNG as your master and send whichever version the recipient accepts.

It is converted as a single still frame. This page always writes one image per file, so an APNG loses its animation even though the WebP format itself is perfectly capable of storing frames.

It works on any modern phone browser and nothing is uploaded — the encoding is a canvas call inside the page. The real limit on mobile is memory: a handful of 40-megapixel PNGs at once can exhaust a phone tab, so convert those in smaller batches.