Make images smaller

Most oversized images are oversized for one of two reasons: the wrong format, or dimensions far larger than anything will ever display them at. Both are fixable here, and the second usually matters more than the first.

Drop a folder, set a longest-edge cap under Advanced, pick a preset, and everything comes back as one zip.

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Worth knowing

Resizing beats re-compressing
A 4000px photograph displayed in a 800px column is carrying twenty-five times the pixels it needs. Capping the longest edge under Advanced will nearly always save more than any change of format or quality setting.
WebP is the safe modern choice, AVIF the aggressive one
WebP is typically a third smaller than JPEG and is supported by every current browser and most software. AVIF is smaller still, encodes more slowly, and is refused by a fair amount of non-browser software. Pick by audience.
The presets are a real trade, not a placebo
Smallest, Balanced and Best pass genuinely different quality values to the encoder, and the size difference in the results is measurable. Lossless does not re-encode lossily at all — on a target that cannot express that, the row says so rather than pretending.

The specific conversions