Does transparency survive?

Yes. WebP stores an alpha channel just like PNG, so transparent backgrounds come through intact.

How much smaller will the file be?

Often dramatically — transparent PNGs frequently drop by 60–80%.

Is it lossless like PNG?

No. Encoding is at 92% quality, a generally invisible trade for a much smaller file. Keep the PNG as your editing master.

Are my images uploaded?

No. Conversion runs entirely in your browser.

How to Convert PNG to WebP (Smaller, Still Transparent)

How to convert PNG to WebP

Transparent PNGs are the heaviest images on most websites. A hero graphic or product cut-out saved as a lossless PNG can easily run to several hundred kilobytes, and PNG offers no way to trade a little quality for a much smaller file.

WebP does, and it supports the same alpha channel. This guide shows how to convert PNG to WebP free in your browser without losing the transparency.

Convert PNG to WebP in your browser

Transparency is preserved and the conversion runs on your own device — nothing is uploaded.

1Open the free PNG to WebP converter.
2Drag in your PNGs, or click to browse for them.
3Each is re-encoded as a WebP with its alpha channel intact.
4Download a single WebP, or a ZIP if you converted a batch.

Why the saving is so large

PNG is lossless: it stores every pixel exactly, which is expensive for anything photographic or gradient-heavy. WebP allows a small, visually imperceptible quality trade in exchange for far better compression, and unlike JPG it does that without giving up transparency.

In practice transparent PNGs routinely drop by 60–80%. An 800 KB hero image landing under 200 KB is a normal result.

Keep the PNG as your master

Because the WebP is lossy, treat it as an export rather than a replacement. Keep the original PNG for future editing, and regenerate the WebP whenever the source changes — that way you never re-compress an already-compressed image.