PNG to WebP

// Why WebP is worth it for web images

If a PNG is destined for a website, converting it to WebP is one of the easiest size wins available: WebP files come out roughly 25 to 35 percent smaller than PNG at similar visual quality, and every modern browser displays them natively. Smaller images mean faster pages, and faster pages are the point.

Crucially for PNGs, WebP supports transparency. Logos, icons, and UI graphics with alpha channels convert without losing their see-through regions, which is what makes this conversion viable where PNG to JPG is not.

// How the encode works and the one caveat

The tool decodes your PNG in the browser, draws it to a canvas, and encodes a WebP at the quality you pick on the slider. WebP output here is lossy, so lower settings trade visible artifacts for smaller files; nudge the slider until the size and the look both satisfy you. The whole process is local, with no upload and full offline operation once the page has loaded.

The caveat: WebP's weak spot is not browsers but older desktop software, some of which still cannot open it. If the image needs to round-trip through legacy tools, keep a PNG copy. Also note the canvas re-encode strips any metadata the PNG carried.

// fair questions

Where does the conversion actually happen?

On your own machine. The browser does all the decoding and encoding locally, the PNG is never uploaded, and no copy of your image exists anywhere except your device.

Does WebP keep my PNG's transparency?

Yes. WebP has full alpha support, so transparent and semi-transparent pixels survive the conversion. That makes it the size-reduction path for logos and graphics that JPG cannot offer.

How much smaller will the file get?

Typically in the range of 25 to 35 percent smaller than the PNG at similar quality, though it varies with the image. Flat graphics, photos, and screenshots each compress differently, so the slider and the reported output size tell you the real answer.

Is there any reason not to switch to WebP?

Only compatibility outside the browser. All modern browsers render WebP, but some older desktop applications cannot open it, so keep the original PNG if the image has to pass through legacy software.