The XLS file format stores data in the XLS format. Converting to MOBI produces a ebook file that stores reflowable text in the Mobipocket format originally designed for Amazon Kindle devices, now largely superseded by KFX. This conversion changes the file's encoding, compression method, and supported feature set. Metadata such as creation date and embedded colour profiles is preserved where the target format supports it. This makes MOBI the practical choice when the destination system requires it or when the original format is not supported by the target application. 1converter runs this conversion on the server: your file is uploaded encrypted over HTTPS, converted using trusted open-source libraries, and the output is held for 24 hours before automatic deletion.