JPG quality and file size

What the slider does

The setting drives the JPEG encoder from 1 to 100: it decides how much information the encoder may simplify. Two different images do not react the same way to the same value.

Starting values

• 95 to 100: archiving, print, images that will be retouched.
• 85 to 92: a good balance for the web; 90 is the default here.
• 70 to 84: thumbnails, previews, quick sharing.
• Below 60: artefacts become visible on gradients and edges.

Measurements

The final size depends on the image and on the browser. On a photograph, going from 95 to 90 and then to 80 reduces the file at every step; on a flat-colour graphic the difference is minimal.

We do not publish a measurements table until it has been taken on this site. What the converter shows, however, is always the real size of your files: convert one image at two values and compare.

Why a JPG can be larger than a PNG

A screenshot, a logo or a flat illustration is already compressed very well in PNG. JPG, designed for photographs, adds artefacts without saving size.

The converter shows the real size of both files. If the JPG is larger, the interface says so explicitly instead of presenting the result as a saving.

Reducing size without losing what matters

Lowering quality is the most direct lever, but dimensions matter more. This tool does not resize images: for a genuinely smaller file, reduce the image dimensions in an editor first, then convert.