Conversion with the same resolution as the original weighs more

[projct1]

public function registerMediaCollections(): void
{
    $this->addMediaCollection(MediaCollectionEnum::PlacePhoto->name)->registerMediaConversions(function (Media $media) {
        $this->addMediaConversion('xl')
            ->fit(Fit::Max, 1980)
            ->format('webp');
    });
}

$this->place->addMediaFromUrl($url)
    ->setName($photo->description)
    ->setOrder($index)
    ->toMediaCollection(MediaCollectionEnum::PlacePhoto->name);

My original file is 1980 px and 217 kb. And conversion xl is also 1980 px and 292 kb. Why?