CSV to XLSX: make Excel open your data properly
Open a CSV in Excel and you risk mangled encodings, dates turned into ####, and leading zeros stripped from IDs. Converting CSV to a real XLSX first avoids most of these import surprises.
ConvertFlow wraps your CSV into a proper .xlsx workbook entirely in your browser using SheetJS — no server sees your rows.
Works great for bank exports, SaaS downloads and database dumps. Then convert back XLSX → CSV anytime with the same tool.
More local-first tools
- StatementFlow — Bank statement → CSV/Excel, parsed locally in your browser
- GeoFlow — Address → county, district & timezone enrichment