# Excel Format Converter ## Product positioning Convert XLS and XLSX files locally so spreadsheets can be opened, edited, and shared across office software versions. ## Core features XLS file reading; format conversion; output path selection; conversion result validation. ## Input and output Input: an XLS file Output: an XLSX file ## Supported platforms Windows, macOS, and Linux; runs locally and offline. ## Business model Free tier: 3 uses per day Perpetual license removes usage limits. ## Processing notes Files are processed locally and are not uploaded to third-party services.