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.

What quality setting should I use?

Between 60 and 80 for photographs: at normal viewing size the difference is invisible and the file is often a quarter of the original. Below 50, edges start to smear.

Can I resize at the same time?

Yes, and it is usually the bigger win. A 4000-pixel photo shown at 800 pixels wastes most of its data — resizing first saves more than any quality setting.

Compress Image

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

Runs in your browser — nothing uploadednew

Report a problem

How to use 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.

What quality setting to choose

Quality	Looks like	Typical saving
90–100	Indistinguishable from the original	10–30%
75–85	No visible difference at normal size	50–70%
60–70	Slight softening in fine detail	70–85%
40–55	Visible artefacts around edges and text	85–92%
Below 40	Obviously degraded	90%+

Resizing usually saves more than quality does. A 4,000-pixel photo displayed 800 pixels wide is carrying twenty-five times the data it needs.

JPEG loses a little every time it is saved. Compress the original once rather than compressing a compressed copy.

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.
What quality setting should I use?: Between 60 and 80 for photographs: at normal viewing size the difference is invisible and the file is often a quarter of the original. Below 50, edges start to smear.
Can I resize at the same time?: Yes, and it is usually the bigger win. A 4000-pixel photo shown at 800 pixels wastes most of its data — resizing first saves more than any quality setting.

Auf Deutsch: Bilder verkleinern · En français : Compresser une image