How to use it
- Drop your PNG files onto the box below.
- Leave the format on Auto for the largest saving.
- Press Process files and download the result.
Why Auto converts PNG to WebP
PNG is a lossless format, which means the encoder is not allowed to discard anything. A quality slider therefore does nothing at all to a PNG, and any tool promising otherwise is quietly converting it to something else. Auto mode is explicit about this: it re-encodes as WebP, which supports both transparency and lossy compression, and routinely produces a file a tenth of the size with no visible difference.
When you should keep PNG
Choose PNG in the format row if the file has to stay PNG, for instance because it feeds a system that rejects anything else. You will still get a modest saving from re-encoding, because many exporters write PNGs with wasteful settings. For screenshots of text and interfaces, WebP is almost always the better answer.
Questions
Does converting to WebP lose transparency?
No. WebP supports an alpha channel, so transparent areas survive the conversion intact.
Will WebP open everywhere?
Every current browser supports WebP, as do modern versions of Windows, macOS, Android and iOS. Very old software may not, in which case pick PNG or JPG instead.
Why did my PNG get bigger?
Some PNGs are already optimal. In Auto mode the original is handed back untouched rather than giving you a worse file.