Slightly, and the preview shows you exactly how much before you commit. Photographs tolerate heavy compression well; screenshots and images with text degrade visibly much sooner.

What makes the biggest difference?

Dimensions, not quality. An 8000px photo displayed at 1200px carries six times the pixels anyone will see — resizing saves far more than re-encoding.

Compress Image

Resize and re-encode photos to hit a target size, with before and after shown.

Runs in your browser — nothing uploadednew

How to compress image

Choose the photo that is too large.
Set a target size or quality, and optionally cap the dimensions.
Check the before and after, then download.

Questions

Will it look worse?: Slightly, and the preview shows you exactly how much before you commit. Photographs tolerate heavy compression well; screenshots and images with text degrade visibly much sooner.
What makes the biggest difference?: Dimensions, not quality. An 8000px photo displayed at 1200px carries six times the pixels anyone will see — resizing saves far more than re-encoding.

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