WebP Converter and Image Optimizer

What It Changes

Three things, in order of how much they matter. Dimensions first: a 4000 pixel photograph displayed in an 800 pixel column is wasting most of its bytes before any format question arises. Format second: WebP and AVIF are meaningfully smaller than JPEG at the same visual quality. Metadata third: camera data and colour profiles add weight nothing renders.

Reading the Output

FILE              BEFORE    AFTER    CHANGE
hero-team.jpg     2.4 MB    186 KB   resize + webp
product-01.png    880 KB     94 KB   webp
diagram.png       210 KB    198 KB   kept png, has text
logo.svg          14 KB      11 KB   minified

BATCH             3.5 MB    489 KB

NOTE  diagram.png kept as PNG. Text in images
      degrades under lossy compression.

The largest saving is the resize, not the format change. The hero image was a full-resolution photograph in a slot that never displayed it at that size, which is the single most common cause of a slow page and is invisible until someone measures it.

The kept PNG matters too. Screenshots and diagrams containing text look bad under lossy compression, and a tool that converts everything indiscriminately produces images that are smaller and unusable.

Questions