Why convert PNG to WebP?
WebP is a picture format made for the web. For the same picture it usually gives a smaller file than PNG, and it keeps transparency. Smaller pictures mean less to download, which helps a page appear sooner. Every current browser can show WebP.
How much you save depends on the picture. Photos and screenshots with many colours often shrink a great deal. Simple drawings with a few flat colours shrink less, and a small, well-packed PNG can even come out larger as a WebP. The tool shows the change for every file, so you can see for yourself before you save anything.
How this tool works
Choose one or more PNG files, or drop them on the field. Your browser decodes each picture and writes it again as WebP. Nothing is sent to our server: the files never leave your device, so it is safe to convert pictures that aren’t public yet. This is also why the tool has no daily limit.
The preview shows the picked picture with a line across it: the original PNG is on the left of the line and the WebP on the right. Drag the slider under the picture to move the line and look for differences. You can also show only one of the two, and choose the background, which helps with transparent pictures.
The quality slider sets how hard the picture is squeezed. A lower number gives a smaller file and more visible loss of detail; a higher number keeps more detail and gives a larger file. The preview and the sizes are worked out again as you move it. 80 is where the slider starts; it is our starting point, not a rule, so judge by the preview.
Under the preview are three figures for the picked picture: the size of the original, the size of the WebP, and the saving in percent. Below them is the list of your files, each with its size before and after and the change in percent. Select a file to see it in the preview, save files one by one, or save them all.
What this tool can’t do
The conversion is lossy: some detail is given up to make the file smaller, as with JPEG. WebP also has a lossless mode, but browsers don’t offer it to web pages in the same way everywhere, so this tool doesn’t promise it. If you need a copy that matches the PNG dot for dot, use a desktop tool such as Google’s cwebp with its lossless setting.
The result comes from your browser’s own WebP encoder. Different browsers can give slightly different files and sizes for the same picture and quality, and a dedicated encoder may produce a smaller file. An animated PNG becomes a single still picture. Extra data stored in the PNG, such as a colour profile or text notes, is not carried over, so colours in pictures with an unusual profile may shift a little.
Very large pictures may fail to convert on a device with little memory. If that happens, the tool says which file it couldn’t read.