We recommend using the following tool after you have resized images:
You simply upload your resized images and the tool will allow you to download a zip file of optimised images.
Smush.it uses optimisation techniques specific to your image format to remove unnecessary bytes from image files. It is a "lossless" tool, which means it optimises the images without changing their look or visual quality. After Smush.it runs on a web page it reports how many bytes would be saved by optimizing the page's images and provides a downloadable zip file with the minimized image files.
Once you have the zipped file, simply unzip it to a folder on your PC and then upload the optimised images to Holiday Site Builder.