Choose images, display them in a table, and save them in a zip file (or natively using the File System API)
Go to https://dinoosauro.github.io/image-to-zip/ and choose the images you want to save in a Zip file. All of them will be displayed in a table.
Above the table, you can choose to compress the zip file (and its compression level), or to re-encode the images. In this case, you'll be able to choose the output format, the output quality, and the output width/height (in percentage):
Finally, you can choose to save the images in a zip file, or to save them directly on a folder in your device (if your browser supports it).
In the Settings, you can choose how many images should be displayed at a time. Keep this number quite low, otherwise the website might slow down. You can also choose to uncheck the images by default.
Finally, you can download the webpage in a simple HTML file, so that you can use it completely offline.
Your data is never sent to an external server: everything is elaborated locally.