How to silently delete files with a bat file

In jammykam's answer, he uses >nul 2>&1. What this does is redirect both standard output and standard error to the null device. However, hiding the standard error is not best practise and should only be done if necessary.

@echo off
del /s *.jpg 1>nul

In this example, 1>nul only hides the standard output, but standard error will still show. If del fails to delete some files, you will be informed.

Read more about redirection

Turn echo off to suppress showing the command being run, and redirect output to null as @Sico suggested.

@echo off
del /s *.jpg  >nul 2>&1

You should see nothing displayed when the bat file is run.