Drop an .xlsx file in and export a clean, standard CSV — even if Excel isn't installed. Handles big sheets, keeps your columns intact, and nothing ever leaves your PC.
You can — if you own Excel, if the file opens without freezing, and if you only need one sheet. But Excel mangles long numbers into scientific notation, silently drops leading zeros from ZIP codes and IDs, and can only save one sheet at a time. On a big export it may not open at all. Gridzu skips those traps.
Gridzu.xlsx onto Gridzu. Each sheet becomes its own table.Gridzu also opens CSV and exports back to CSV, so it doubles as a free Excel alternative for data files. While the sheet is open you can remove duplicates, trim stray spaces, and delete junk rows before you export — so the CSV that comes out is already clean. Working with a giant workbook? Gridzu opens large files without choking.
Conversion runs on your machine. Your spreadsheet is never sent to our servers — the only thing our service stores is the email you sign in with.
Open the .xlsx file in Gridzu and export it as CSV. You don't need Excel installed — Gridzu reads Excel workbooks directly and writes a clean, standard CSV. It works works offline on Windows 10 and 11.
Yes. Gridzu opens each sheet as its own table, and you can export any or all of them to CSV — one file per sheet, since CSV only holds a single table.
Yes. Gridzu is built for large files and can convert sheets with hundreds of thousands or millions of rows that would slow Excel to a crawl.
No. The conversion happens entirely on your own computer. Your spreadsheet is never sent to our servers.