I was working on application design in Photoshop and here we need a webp file. How do I save or export from Photoshop as webp?
Photoshop doesn't have it added to its program on the go. That meaning you'll have to download a plugin in order to export to webp formats.
You can find the plugin for Photoshop here: https://developers.google.com/speed/webp/docs/webpshop
As soon as this is installed you should be able to save/export to the extension.
You can find free plugins for Photoshop here (select the appropriate platform):
I know this is old but the accepted answer goes to a link and that tutorial is not very clear.
Windows installation steps
Download the latest
ZIP source file(do not download the script only) from: https://github.com/webmproject/WebPShop/releases
Copy the plug-in file WebPShop.8bi located in the zip file,
bin\WebPShop_0_3_0_Win_x64to the Photoshop installation folder, usually
C:\Program Files\Adobe\Adobe Photoshop\Plug-insfor x64.
Restart Photoshop. "Open" and "Save" menu commands should now show WebP files.
Recommended options: slowlest compression and more than 80% of quality, preview enabled.