How to convert many images in console (Windows)

1. Get "GraphicsMagick" utility and install it.

2. Create batch-file (.bat) and paste:

echo off

cls

set /p sd="Enter source directory (example: C:\source directory\ ) : "

if %sd:~-1%==\ (echo Ok) else (set sd=%sd%\)

set /p d="Enter destination directory: (example: C:\dest directory\ ) : "

if %d:~-1%==\ (echo Ok) else (set d=%d%\)

set /p s="Enter source extension (example: .tif ) : "

if %s:~0,1%==. (echo Ok) else (set s=.%s%)

set /p n="Enter necessary extension: (example: .png ) : "

if %n:~0,1%==. (echo Ok) else (set n=.%n%)

xcopy ^"%sd%*%s%^" /s /i ^"%d%^"

cd ^"%d%^"

for /r %%1 in (*%s%) do gm convert ^"%%~dpnx1^" ^"%%~dpn1%n%^" & erase /f /q ^"%%1^"

3. Run it.