Requirements
There are many methods to compress images. I used the open source software ImageMagick.
One of the greatest benefits using ImageMagick is, that you don’t need to install anything – there’s a portable version.
In this example I used ImageMagick-7.1.0-4-portable-Q16-HDRI-x64.zip
goto the download page
Information
Goal
Each jpg file within a folder shall be compressed.
Setup
After you downloaded the latest portable version, unzip it in the desired location. ImageMagick is powerful but for this batch file we only need the “magick.exe” everything else can be deleted.
The Magic
This is nearly the whole magic.
This line will store every file name into the variable f and call the magick.exe with the defined parameters.
for %%f IN (*.jpg) DO magick convert "%%f" -quality 30 "%%f" Batch file
Folder structure
.
├── images
│ ├───image01.jpg
│ ├───image02.jpg
│ ├───image03.jpg
├── compress.bat
├── magick.exe
├── start.bat
└── ... start.bat
This file will call the other batch file with 1 parameter – the folder path where the images are located
@echo off
CALL compress images compress.bat
This file will call “magick.exe” in the same directory with parameters
@echo off
set path=%1
for %%f IN (%path%/*.jpg) DO magick convert "%path%/%%f" -quality 30 "%path%/%%f"