Other

What is a .webp file?

A .webp is a modern web image format from Google — smaller than JPEG or PNG at similar quality. Browsers handle it fine; some older desktop apps don't.

This extension has been used by more than one format

3 different formats have claimed .webp over the years, so two files with the same extension aren't necessarily the same kind of thing.

WebPVersion Lossy · fmt/566
WebPVersion Lossless · fmt/567
WebPVersion Extended · fmt/568

How to open a .webp file

WindowsAny browser
WindowsPhotos
WindowsIrfanView
WindowsGIMP
MacPreview
MacAny browser
LinuxGIMP
LinuxEye of GNOME

How to convert a .webp file

Open in Paint, Preview or GIMP and save as .jpg or .png.

MIME type

When a .webp file travels over the web, servers label it with this MIME type:

image/webp

What's a MIME type?

The technical record

For archivists, developers and the merely curious: these are the PRONOM registry entries for .webp.