About CSV ↔ Excel
Convert CSV files into real .xlsx workbooks and back again using SheetJS, keeping every row and column intact. Everything happens locally in your browser: nothing is uploaded, stored, or logged. This focused CSV ↔ Excel page is designed for office users and analysts switching between portable CSV data and formatted Excel workbooks. It opens directly to the working tool, rather than hiding the function inside a general converter or account dashboard.
The input is parsed by JavaScript already loaded in the page, transformed in memory, and returned through a local browser download or copy action. Your filename and file contents stay on the device. There is no upload queue, temporary cloud copy, account record, or server-side conversion job to delete later. That makes the tool practical for personal records, work material, and drafts that should not be handed to an unknown processing service.
The operation stays focused on round-trip between csv and .xlsx. You can inspect the result immediately and repeat the task with different settings without a quota or watermark. Processing speed and maximum size depend on your browser and available device memory, which is the honest trade-off for doing the work locally.
FileForge charges nothing for this tool and does not add a watermark. Once the page and its processing engine have loaded, the operation can continue without sending the file over the network. Use the numbered steps below, download the result, and review it before replacing an original file.