TL;DR: Online forms demand images under a hard limit — "signature under 20 KB," "photo under 50 KB. " Most compressors make you upload your file to a server to hit that. I built SwiftShrink to do it entirely in the browser: a binary search over JPEG quality, with a dimension-shrink fallback, all...
Source: [Dev.to](https://dev.to/talhaasjad/i-built-an-image-compressor-that-hits-an-exact-kb-size-and-never-uploads-your-files-3jnc)