PNG to WebP Converter - Free, No Upload
Convert a PNG image to WebP entirely in your browser. WebP supports transparency just like PNG, so alpha channels are preserved rather than filled with a background colour.
Maintained by Hirantha Sandaruwan Lakshan. Updated 31 July 2026.
How it works
The PNG is decoded and drawn to an off-screen canvas, preserving its alpha channel, then re-encoded as WebP - which supports lossless and lossy transparency, unlike JPEG.
For flat-colour images like icons and screenshots, WebP at a high quality setting is usually noticeably smaller than the source PNG with no visible difference.
If your browser can't encode WebP natively, a small WebAssembly encoder loads automatically as a fallback, verified with a real encode test rather than a browser check.
Worked examples
Shrinking a transparent logo for the web
Converting a PNG logo to WebP keeps the transparent background while typically cutting the file size noticeably.
Optimising app icons or UI assets
Batch converting a set of PNG icons to WebP reduces total asset weight without visible quality loss at a high quality setting.
Reducing a screenshot's file size
PNG screenshots compress well to WebP since the format handles flat colour and sharp UI edges efficiently.
Frequently asked questions
Does WebP keep my PNG's transparency?
Yes, WebP supports an alpha channel the same way PNG does, so transparent areas stay transparent.
Will WebP always be smaller than PNG?
Usually, especially for photos or complex images. For very simple graphics the difference can be small.
Is my image uploaded anywhere?
No, conversion happens entirely in your browser tab.
Can I convert several PNGs at once?
Yes, drop in a batch and they'll convert together.
How much smaller is WebP than PNG?
Often dramatically smaller - 50% or more on screenshots and graphics, sometimes over 80%. PNG's lossless compression is simply less efficient than what WebP can do.
Is WebP lossless like PNG?
It can be, but this tool encodes lossy WebP by default, which is where the big savings come from. For graphics with flat colour the difference is usually invisible.
Does WebP keep my transparency?
Yes, transparency is preserved through the conversion.
Will WebP work everywhere PNG does?
In browsers, yes. In older desktop applications and some email clients, not always - keep a PNG if the file has to open in arbitrary software.
Does this work on my phone?
Yes - it runs in your phone's browser exactly like on a computer, with no app to install.
Sources & references
Updated Jul 31, 2026