Shrink JPG and WebP without losing quality.
Images are usually the largest thing on a page, and page weight is a ranking factor as well as a bounce factor. Compressing a hero image from 2 MB to 200 KB is typically the single biggest speed win available on a marketing page.
Compression runs in your browser, so nothing is uploaded. Adjust the quality until the preview stops looking acceptable, then back off one step.
For photographs, quality around 80 is usually indistinguishable from the original at a fraction of the size. Screenshots with text and sharp edges are less forgiving — artefacts appear around type first, so check the smallest text in the preview before committing.
Re-encoding drops EXIF, which is a privacy win: camera photos carry GPS coordinates and device identifiers that you almost never want on a public page.
WebP, in nearly every case. It is 25-35% smaller than JPEG at equivalent quality, supports transparency like PNG, and every browser in current use supports it.
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