How can I reduce JPEG file size in KB on Windows 11 without losing quality?

This is likely the best match for what you're looking for how to reduce jpeg file size in Windows 11. It's an open-source, and modern application designed specifically for batch processing images on Windows 10 and 11.

Why it's a good fit: It's free, and it's not one of the "bloated" paid tools. It runs completely on your local machine, which is great for privacy and speed.

How to reduce jpeg file size in windows 11:

1. You can install it via the command line using winget, which you mentioned you prefer. Just open a terminal (Command Prompt or PowerShell) and run: winget install --id=Cognirush.MassImageCompressor -e.

2. You can also download a portable version from its official releases on GitHub. This means you can unzip it to a folder and run it without any installation or admin rights .

3. Once open, you add your hundreds of photos, adjust a quality slider to balance file size (KB) and visual clarity, and hit compress. It will create new, smaller versions of your files without touching the originals.

If you prefer a visual interface to preview the results, Mass Image Compressor is the excellent fallback you asked for. And it is extremely lightweight and fast for batch processing hundreds of images.