Building an automatic cloud-based solution using Vanilla JavaScript, specifically with XMLHttpRequest and the Fetch API, to compress spreadsheet files offers a streamlined and accessible approach to data optimization in modern workflows. This solution is ideal for lightweight web applications, client-side integrations, and environments where minimizing bandwidth and storage is essential. By leveraging native JavaScript capabilities, developers can create a responsive, browser-compatible system that reduces file size in real time-without relying on external libraries or server-heavy logic. Supported formats include .xlsx, .xls, .csv, .tsv, .numbers, and more.

In essence, this Vanilla JavaScript solution provides a nimble, cloud-compatible method for automating spreadsheet compression. It empowers developers to build fast, secure, and scalable workflows using only native browser technologies. Whether embedded in a web portal, integrated into a SaaS platform, or used as a standalone tool, this system ensures that spreadsheet files are lean, efficient, and ready for transfer or storage-without the manual effort.