A few months ago, I needed to convert 400 product images from JPG to WebP for a Shopify store. I tried the usual online converters. Every single one of them made me upload my files to a server, wait in a queue, and then download a ZIP.
Source: [Dev.to](https://dev.to/muhayminbinmehmood/how-i-built-a-bulk-image-converter-that-runs-entirely-in-your-browser-1be0)