How to convert my photos to webp format of Google in windows 8.1?

Question

I want to convert my photos from jpg, gif, and png to WebP format.

When I'm trying to use CMD for using cwebp command, I got this error message :

'cwebp' is not recognized as an internal or external command, operable program or batch file.

What should do I do?

I've downloaded all the files needed such as libwebp-0.4.0-windows-x86.zip and WebpCodecSetup.exe.

Even I've installed Visual Studio to use its command prompt, but didn't work! Is there anyone who can help me?

One more question:

Is anyone know any tool to reduce image size without losing its quality?

Answer 1

Download cwebp binaries (.exe) and run it with PowerShell:

# tip: on windows explorer shift + right-click a directory and copy its path
$dir = "path/to/photos/directory"

# get all files in the directory
$images = Get-ChildItem $dir

foreach ($img in $images) {
  # output file will be written in the same directory 
  # but with .webp extension instead of old extension
  $outputName = $img.DirectoryName + "\" + $img.BaseName + ".webp"

  C:\webp-converter\libwebp-0.6.1-windows-x64\bin\cwebp.exe $img.FullName -o $outputName
}

See also cwebp options.

Answer 2

To convert any image format to webp from Windows command line (CMD)

Download latest webp release from this page

I downloaded this package because my system is a 32 bit windows 10

Extract it and set environmental variable (follow below steps)

Click start button type "view advanced system settings" and open it (this step may differ in win xp or win 7) Click Environment Variables>User Variables>New>Variable Name:path Variable Value:C:\libwebp-1.0.2-windows-x86\bin

Now open CMD > Go to Image folder run following command

cwebp -q 50 -m 6 -af -f 50 -sharpness 0 -mt -v -progress source_img.jpg -o converted.webp