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

Use Microsoft Paint (Built-in and quick method).

Microsoft Paint is one of the simplest tools on Windows 11 for reducing JPEG file size without installing any extra software. It is especially useful when you only need to compress a few images quickly. While it doesn’t offer advanced compression settings, it can significantly reduce file size by resizing the image and saving it in JPEG format, which automatically applies compression. This makes it a convenient option for basic optimization tasks.

How to reduce jpeg file size in kb below 100kb

Step 1: Right-click your image → select Open with > Paint

Step 2: Click Image > Resize and skew

Step 3: Choose Percentage and reduce it (e.g., 100% → 50% or 25%)

Step 4: Make sure Maintain aspect ratio is checked

Step 5: Click File > Save as > JPEG picture

Step 6: Save the new compressed image

Using Microsoft Paint is a fast and beginner-friendly way to reduce JPEG file size on Windows 11. By simply resizing the image and saving it as a JPEG, you can significantly lower the file size in KB without needing any third-party tools.