This library provides a simple encoder and decoder for webp.
In your csproj :
<PackageReference Include="WebP_Net" Version="2.0.0" />
Or, if you using .net cli :
dotnet add package WebP_Net --version 2.0.0
using System.Drawing;
using WebP.Net;
var bitmap = WebPDecoder.Decode(File.ReadAllBytes("..."));
using var webp = WebPEncoder.EncodeLossless(bitmap);
File.WriteAllBytes("...", webp.AsSpan().ToArray());
using WebP.Net;
var version = WebPLibrary.GetVersion();