Excel to CSV Converter

Drop in an .xlsx, choose the worksheet and separator, review the warnings, then press Convert selected sheet. Copy the text or download the named CSV or TSV. The workbook is processed locally and never uploaded.

CSV cannot hold formulas. A formula cell becomes the cached value stored when the workbook was last calculated and saved; if no cached result exists, it may be blank. Formula-like text such as =2+2 is different: you can keep that text exact for a database import, or deliberately prefix it with an apostrophe so a spreadsheet will treat it as inert text when reopened.

Every worksheet is listed, and you choose which one to convert. One CSV holds one table, so sheets are never merged silently; switch the selector and convert again if you need a separate file for another sheet. Multi-sheet workbooks include the sheet name in each download filename.

Yes. A value containing the chosen separator, a quote or a newline is quoted and escaped. The same rule applies when you choose semicolon CSV or tab-separated TSV, so embedded delimiters do not shift later columns.

Because those zeros were usually formatting rather than part of the value. A product code typed as 00123 into a numeric cell is stored as 123 and shown padded by a number format, and a format is precisely what a CSV cannot carry — what gets written out is the stored value. The fix is upstream: set the column to Text in the spreadsheet, then retype or re-paste the codes so the zeros belong to the value itself. Cells already stored as text come through unchanged, which is the state to aim for.

The download is UTF-8. A CSV carries no formal encoding declaration, so some desktop Excel versions guess a legacy code page when a file is double-clicked, which turns accented and non-Latin characters into mojibake. Tick the UTF-8 marker option when the file is primarily for desktop Excel; leave it off for strict shell, code or database imports that do not want the three marker bytes. The preview and Copy button never include the marker.

Re-save it as .xlsx first — Excel, LibreOffice and Google Sheets all offer that from Save As or Download. The file picker and validator accept only the modern zipped .xlsx format, so a pre-2007 binary .xls receives a direct explanation instead of a vague workbook error.

Rows here end with a carriage return and a line feed, which RFC 4180, the nearest thing CSV has to a specification, asks for. Windows software expects it and most Unix tools cope, but not all: a strict line-splitter can leave a stray carriage return on the end of every row, showing up as a ^M in an editor or an invisible extra character on the last field. If that bites, dos2unix or tr -d clears it in one pass — worth ruling out early, since it breaks the final column quietly.

Choose Semicolon — European Excel under Output separator. The converter then quotes fields against semicolons rather than commas and downloads a .csv. Choose Tab — TSV instead when the destination asks for tab-separated text; no unsafe find-and-replace is needed.